Test Bank For Essentials of Dental Radiography For Dental Assistants and Hygienists 10th Edition by Thompson
Test Bank For Essentials of Dental Radiography For Dental Assistants and Hygienists 10th Edition by Thompson
Test Bank For Essentials of Dental Radiography For Dental Assistants and Hygienists 10th Edition by Thompson
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3) Who developed the hot cathode ray tube?
A) W. D. Coolidge
B) A. Cieszynski
C) H. R. Raper
D) O. Walkhoff
Answer: A
Explanation: A) William David Coolidge developed the shockproof hot cathode tube while
working for General Electric Company in 1913.
B) William David Coolidge developed the shockproof hot cathode tube while working for
General Electric Company in 1913.
C) William David Coolidge developed the shockproof hot cathode tube while working for
General Electric Company in 1913.
D) William David Coolidge developed the shockproof hot cathode tube while working for
General Electric Company in 1913.
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5) What New Orleans dentist first made practical use of x-rays in the treatment of dental
patients?
A) H. R. Raper
B) G. M. Fitzgerald
C) F. Mouyen
D) C. E. Kells
Answer: D
Explanation: A) C. Edmund Kells took the first dental radiograph on a living subject in the
United States. He was the first to put the radiograph to practical use in dentistry. Dr. Kells made
numerous presentations to organized dental groups and was instrumental in convincing many
dentists that they should use oral radiography as a diagnostic tool.
B) C. Edmund Kells took the first dental radiograph on a living subject in the United States. He
was the first to put the radiograph to practical use in dentistry. Dr. Kells made numerous
presentations to organized dental groups and was instrumental in convincing many dentists that
they should use oral radiography as a diagnostic tool.
C) C. Edmund Kells took the first dental radiograph on a living subject in the United States. He
was the first to put the radiograph to practical use in dentistry. Dr. Kells made numerous
presentations to organized dental groups and was instrumental in convincing many dentists that
they should use oral radiography as a diagnostic tool.
D) C. Edmund Kells took the first dental radiograph on a living subject in the United States. He
was the first to put the radiograph to practical use in dentistry. Dr. Kells made numerous
presentations to organized dental groups and was instrumental in convincing many dentists that
they should use oral radiography as a diagnostic tool.
6) Early researchers working in the field of radiography were not aware that continued exposure
to x-rays produced accumulations of radiation effects in the body because x-rays are invisible.
A) Both the statement and reason are correct and related.
B) Both the statement and reason are correct but not related.
C) The statement is correct, but the reason is not.
D) The statement is not correct, but the reason is correct.
E) Neither the statement nor the reason is correct.
Answer: A
Explanation: A) Because x-rays are invisible, scientists and researchers working in the field of
radiography were not aware that continued exposure produced accumulations of radiation effects
in the body and therefore could be dangerous to both patient and radiographer.
B) Because x-rays are invisible, scientists and researchers working in the field of radiography
were not aware that continued exposure produced accumulations of radiation effects in the body
and therefore could be dangerous to both patient and radiographer.
C) Because x-rays are invisible, scientists and researchers working in the field of radiography
were not aware that continued exposure produced accumulations of radiation effects in the body
and therefore could be dangerous to both patient and radiographer.
D) Because x-rays are invisible, scientists and researchers working in the field of radiography
were not aware that continued exposure produced accumulations of radiation effects in the body
and therefore could be dangerous to both patient and radiographer.
E) Because x-rays are invisible, scientists and researchers working in the field of radiography
were not aware that continued exposure produced accumulations of radiation effects in the body
and therefore could be dangerous to both patient and radiographer.
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Copyright © 2018 Pearson Education, Inc.
7) The most significant advancement in the early days of radiography came in 1913 when W. D.
Coolidge
A) became the first to alert the profession of the dangers of radiation exposure and advocated for
the science of radiation protection.
B) exposed a prototype of a dental radiograph, setting the stage for preventive oral health care.
C) developed a variable, high kilovoltage x-ray machine compatible with the paralleling
technique.
D) introduced an x-ray tube that allowed for an x-ray output that could be predetermined and
accurately controlled.
Answer: D
Explanation: A) The introduction of the Coolidge tube allowed for an x-ray output that could be
predetermined and accurately controlled.
B) The introduction of the Coolidge tube allowed for an x-ray output that could be
predetermined and accurately controlled.
C) The introduction of the Coolidge tube allowed for an x-ray output that could be
predetermined and accurately controlled.
D) The introduction of the Coolidge tube allowed for an x-ray output that could be
predetermined and accurately controlled.
NEW HOMES.
Ellen was the first of the family that arrived at Hobart Town in Van
Diemen’s Land. Next came the convict-ship, which was sent round to
Launceston to disembark its passengers; that port being nearer the
district where the convict labour was to be employed. When the
batch of parish emigrants arrived, a fortnight afterwards, Frank
found, on application to the proper government officer, that his sister
had landed in good health, and had received a high character from
the clergyman and his lady who had come over as superintendents
of the expedition; that Ellen had been forwarded, with a few of her
fellow-passengers, to the district where a service had been procured
for her as dairy-maid on a settler’s farm; and that care had been
taken that her parents and brother should be indentured to farmers
in the same neighbourhood. So far, all was well. Frank could learn
nothing about his brothers, except that they were to be landed at
Launceston, and that Launceston was within thirty miles of the spot
where he was to be located. The officer he was speaking to had
nothing to do with the arrangements respecting convicts: his
business was to take care of emigrant labourers on their arrival.
Castle himself could not help being pleased at the appearance of
things at Hobart Town, when he and Frank took a walk, the evening
after their arrival. The only objections he could think of were, that
there were few shops; that it was not at all likely that the country
inland should be half so civilized as what he saw; and that it was a
thing he had not been used to, to have Christmas fall at the hottest
time of the year, and the trees green all the winter through. It was
now May; and they told him that winter was coming on, and yet that
the woods would look as green as now all the time; and that the
snow, if there was any, would not lie more than a day on any ground
but the mountain tops, and a bleak common here and there. They
told him that for more than three hundred days in the year the sun
would shine all day, and the air be dry and pure, and seldom too hot
or too cold. All this was what he had not been used to, and did not
know how to believe. His son supposed that if it came true, he would
not object; as one of the consequences of such a climate is that
English people have much better health, and live, on the average, a
good deal longer at Van Diemen’s Land than at home. Castle
peevishly laughed at all talk about life and health, when it was, in his
opinion, doubtful whether they might not be starved to death within
three months. His son left this point to be demonstrated by time
rather than by argument; and meanwhile observed that there were
few signs of starvation about Hobart Town, in which, besides the
government residence, there are nearly eight hundred houses, most
of which are surrounded with gardens; the dwellings having been
originally built on separate allotments of land, of a quarter of an acre
each. The streets cross at right-angles, and command fine views of
the neighbouring country, and afford cheering evidences of the
success of the industry which has sought employment there. A dock-
yard is seen on the river’s brink; and corn-mills, tanneries, breweries,
a hat-manufactory, &c., are conspicuous in the midst of the town. An
amphitheatre of green hills rises to the westward, the crowning
summit of which is 4000 feet high; and from these hills descends a
fine stream of water, flowing through the town into the Derwent,
which, with its varying expanse and beautifully wooded bays and
sloping shores, forms the eastern boundary. This view was little
enough like what Castle had fancied in opposition to all that he had
been told. He was for ever picturing to himself a region of wild
woods, or bleak plains covered with snow; and he was now as much
surprised at the sight of meadows, hills, dales, and a thriving town,
with a blue sky overhead, as if he might not have known as much
before. He had complained of his hard lot in being indentured as a
shepherd; and no wonder, while he thought his flocks were to inhabit
a dreary wilderness; but now that he found he had nothing to fear
from storms and snow-drifts, that the pastures were excellent, the
springs plentiful, and the sheep as fine as the world can produce, he
began to think he might be worse off in point of occupation; though
he would give nobody the satisfaction of hearing him say so. His wife
was to be a domestic servant in the same farm where he was
shepherd; and even little Susan was carefully stipulated for; the
labour of children being valuable at almost any age, in a place where
much more assistance is wanted than can be had.
The first part of their journey to the Dairy Plains, (the district where
they were to settle,) was through the very choicest portion of the
island, both as to beauty and fertility. It is not surprising that those
who first surveyed this tract, and took it as a fair sample of the island
at large, should have represented Van Diemen’s Land as a terrestrial
paradise, and been suspected of exaggeration through the
favourableness of their report. The fact is, the island is supposed to
contain about 15,000,000 acres,—one-third of which is considered
arable, another third fit for sheep-pasture, and the rest unprofitable
at present. The country between Hobart Town and Launceston
consists of green hills and fertile plains, among which towns and
villages and solitary dwellings are interspersed. Rivers wind between
their wooded banks, and streams flow down from the high grounds.
Excellent macadamized roads run through the whole district, and
branch off to the growing settlements on either hand of the main
track. It was a great amusement to Frank to compare whatever he
met with that partook of the civilization of his own country with
whatever looked new and strange. Before leaving Hobart Town, he
had been all the more struck with its printing establishments, its
Mechanics’ Institute, its Book Society, and schools, from observing
the strangeness of the natural productions that he met at every step.
In the gardens he beheld tea trees where he had been accustomed
to see lilacs and laburnums; and cotton plants, myrtles, and
geraniums growing as tall as himself, and spreading out into bushes.
The very grass grows differently;—not stringy in the roots and
carpetlike in the surface, as in England; but in tufts. Parrots, instead
of canaries, were the pets of young ladies; and the bandicoot was
offered for sale instead of the rabbit. Cockatoos instead of crows
were to be frightened away from the fields and gardens; and flocks
of pigeons among the stubble looked as much like partridges as
pigeons; only more beautiful,—with their gold-dropped wings,—than
either species in England. On the road, in like manner, the freestone
bridge over the Jordan, the postman on horseback, the tillage and
inclosures, looked British; but the evergreen woods, in the midst of
which arose the peppermint tree to a lofty height;—the herds of
kangaroos coming out of their covert into the dewy plains at sunrise;
—the spotted opossums climbing and descending the forest trees;—
the black swans sailing on the lakes, and uttering cries like the
creaking of an old sign-board;—all appeared foreign, and scarcely
belonging to the people who had settled among them.
A sight of a yet different character met the eyes of the travellers
near the close of the second day, when they were drawing near their
future abode in the province called Norfolk Plains, in the centre of
which lay the Dairy Plains, where Ellen was expecting them. They
had for some time quitted the broad road, and were following a track
along which their waggon proceeded with tolerable convenience. At
last they came to a point beyond which it had not been carried, and
where a gang of labourers was at work roadmaking;—not as in
England, each man intent upon his own heap of stones, free in limb
and thoughtful in countenance;—not as in Ireland, where some are
lounging and all are joking;—but charged with the fetters of felons,
and superintended by an armed taskmaster. As Frank looked upon
these wretches, with their hardened or woful countenances, he felt
indeed that he was not in England, but in one of her penal
settlements,—breathing the air of one of the places where her vice
and misery are deposited. His very soul became sick when, as the
labourers turned to stare at the somewhat uncommon sight of a
waggon full of travellers, he met the eyes of his convict brothers. He
hoped that his companions would not perceive them; but he soon
found that his father did, by his testy complaints of the jolting of the
cart, of cold and heat, and what not. The unhappy mother looked on
her outcast children with as much curiosity as compassion. Bob
turned away, and stooped to his work, never looking up till they were
out of sight; but Jerry waved his cap and shouted, and dared Frank
to a wager which of them would first be free to work for themselves:
whether it would take longest to work out his sentence, or to pay for
Frank’s passage and settlement. This supplied a new theme of
complaint to Castle, who wrought himself up into a passion about his
being a slave, with all his family. Frank, who hated bondage as much
as any man, thought it could hardly be called slavery to contract to
work for one person for a certain time, in return for advantages which
could not otherwise be obtained. If disappointed of these
advantages,—of sufficient food, clothing, shelter, and money wages,
—the contract was void, and no harm done; if not disappointed, the
object was gained. The evil lay, not in their case as labourers; but as
honest men. Felons ought not to be let off so easily, (because their
labour happened to be more valuable than at home,) as to make
disgrace, for which many of them did not care, their only punishment;
their worldly circumstances being actually bettered by their removal
to a new colony. It was not that labourers need be better off than
their family would probably be, four or five years hence; but that
felons ought not to be placed in as good circumstances as the
honest emigrant at the end of the same period.
Frank was not yet aware (as he afterwards became) that, for want
of knowing the rate of wages at the colonies, emigrants often bind
themselves for a much lower rate than they might obtain if they went
free, or if they were properly informed of the existing state of things;
and thus think themselves deceived, and are tempted to break their
contract when they find how matters stand. This evil is to be referred
to the ignorance of emigrant labourers, quite as much as to the close
economy of the settlers, and should induce all who have heard of it
to obtain such information before concluding their bargain as will
save them from repentance afterwards, and guard them against
quarrels on this score with their new masters;—quarrels, which,
always a great evil, are most so in newly settled countries, where all
hands and hearts are wanted to work together for the common good.
As it is, a British artisan jumps at the offer of a plentiful subsistence
and 2s. a-day besides for five years, out of which the expenses of
his removal are to be paid; and for this rate he binds himself. When
he gets to his destination, he finds that this plentiful subsistence,
including meat, bread, beer or spirits, tea, sugar, comfortable
clothing, and a convenient dwelling, costs no more than 2s. a-day,
and that, if free, he might earn, being a good workman, from 7s. to
12s. a-day, or even 15s., if he be a superior mechanic of a scarce
class. It is mortifying to find that he has sold himself, however much
higher than formerly, for less than he is worth in his new position;
and hence arise discontents which embitter the first years of his new
life, if they do not occasion a breach of contract. The friends of a
rational plan of emigration should do their utmost to make known to
as many as it may concern, to what extent labour is wanted in the
colonies,—what is the rate of money wages in each, and what those
money wages will procure. The official information on these points
transmitted from Van Diemen’s Land in 1827, was, that common
labourers earn 3s. per day; common mechanics 7s.; better
mechanics, from 8s. to 12s.; best ditto, from 12s. to 15s.; and
persons of peculiar qualifications, fitted to superintend farms or other
undertakings, 1l. a-day. Since that time, wages are understood to
have risen. The price of wheat is 7s. a bushel; meat, 2d. or 3d. per
lb.; sugar, from 3d. to 6d.; and tea, from 1s. 6d. to 4s. per lb.—No
wonder that, amidst all their gratitude at being well provided for,
many such workmen as Frank are vexed and mortified to find how
much more they might have made of their labour.
Far other feelings, however, than those of discontent were
awakened in Frank by the aspect of his new abode. It was almost in
a state of nature, his employer, Mr. Stapleton, having preceded him
to take possession only a few days before: but it was far from being
a desolate spot in the midst of a waste, as settlers’ farms are wont to
be in colonies where the unwise object is to disperse the inhabitants,
instead of bringing them near to enjoy the advantages of a division of
labour and reciprocity of consumption. The Dutch government at the
Cape of Good Hope formerly forbade settlers to approach within
three miles of each other; and thus effectually prevented the full
improvement of the land, the construction of roads, and the opening
of a market for exchanges. Hence the Dutch settlers at the Cape are
to this day deprived of many advantages of civilized life. They have
too much of whatever they grow, and too little of what they would fain
buy; and are debarred the comforts of society and mutual help.
These evils are likely to be avoided by the method of disposing of
land now adopted by our government in Australia; the land being
sold on terms which make it the interest of the settler to improve his
tract, and to take advantage of a neighbourhood which may relieve
him of some of his produce. Mr. Stapleton, having been obliged to
choose his land carefully, and to pay 9s. an acre for it, (instead of
6d., or nothing at all, like some of the earlier inhabitants,) was not
tempted to wander away into the wilderness, and sit down where he
might happen to like the prospect, or to be smitten with some new
discovery of fish-ponds, woods, and meadows. He made his choice
instead among the lands of a certain district; and selected such, as
to extent and quality, as would on the whole best suit his purposes,
in conjunction with the privileges of a neighbourhood. His land,
though not of the very first quality, was good enough to have fetched
15s. per acre, if it had lain somewhat more to the north or east,
where the country was rapidly becoming better peopled; but it
stretched towards the unoccupied districts at the foot of the western
mountains, and was less valuable than if it had been surrounded by
civilization, instead of only bordering upon it.—It consisted,—not of
jungle and forest ground, where room must be made by the axe
before seed could be sown and sunshine visit it; but of a lightly
timbered and undulating surface of grass land, wanting only a single
burning to render it fit for the plough, or for a new growth of pasture.
The trees were not of the nature of copse and thicket; but growing in
clumps a hundred feet apart, and with clear stems, measuring ninety
feet or more to the lowest branch; thus affording spots for shade and
shelter without interfering with tillage. The boundaries, where not
formed by natural streams, were fixed by marking the trees; and
there was no immediate need of fences where neither man nor beast
was likely to trespass, and where there was at present no live stock
that could be in danger of straying. No one was near who could be
tempted to steal; for none were poor. The wild cattle, which in former
days did great mischief on the grounds of the settler, had long ago
been driven among the mountains, where it was supposed the race
had died out, as none now appeared. The few oxen and horses that
Stapleton brought with him were kept near the dwelling; and the rest
of the stock was not to follow till all was in readiness for its reception.
A rude shed had been hastily constructed for shelter, under a clump
of trees; and a few sawn planks were lying about: by which Frank
saw that the materials of his business were ready for him to begin
upon without delay. Tools and utensils were stowed away in corners,
or heaped under the trees, till their proper places were provided for
them; and a goodly row of casks and packages of provision stood in
the background. Frank had believed that his spirit of enterprise had
died within him under the hardships of his own country; but he now
felt it revive in a moment; and was anything but dismayed at the
prospect of what he had to do in his capacity of carpenter, before the
scene before him could put on the appearance of a snug and well-
managed farmstead. He saw in fancy the day when a little hamlet of
weather-boarded cottages would be sending up their blue smoke
among those trees; when cattle-sheds and sheep-pens would stretch
out behind the dwellings, and the busy forge and creaking timber-
wain would drown the cry of the quail, and scare away the
kangaroos that were now leaping over the plains. He did not forget to
add a very superior workshop and timber-yard to his picture of his
own dwelling; or to imagine his father looking down from among his
flock on the hills, or Ellen within sight, going forth in the bright early
morning with her milk-pail.
As if to answer to his thought, Ellen now appeared. She had stolen
half an hour to run in search of Mr. Stapleton, to ask once more how
soon he thought Frank might possibly arrive. Mr. Stapleton was
almost as eager for the event as herself; but he knew no more, and
was just dismissing her, disappointed, when the waggon was heard
approaching. While she waited a moment, straining her sight to
make out whether it was the right party, before she ran to meet them,
her brother jumped out, and even Castle started up with more
alacrity than he had shown since they landed. Before they could well
greet one another, Stapleton came up to ask where Frank’s tools
were, and to tell him that he was wanted very much indeed. He could
not refuse him permission to go forward one mile, in order to deposit
Castle and his wife at their new abode; but he lent a hand towards
emptying the waggon of his workman’s packages, and gave him
notice that he should be glad to see him back the first possible
moment.
“You will soon find what great people such as we are here,” said
Ellen, laughing. “This is the place to grow proud in. No more
lounging about the fields, Frank; no more leaning over gates
chewing straws, while nobody inquires for one. You will never need
to touch your hat and ask for work here; people will come begging
you to be so very kind as to put up a door for any pay you please.
This is the place to grow proud in.”
Frank observed, with a grave smile, that pride was dangerous to
one in Ellen’s place.
“Well, then, I will be proud of you, and you shall be proud of me;
and no harm can come of that.”
The first time that the brother and sister could obtain a few
minutes’ conversation without being overheard, Frank inquired,
“Now, Ellen, tell me straight forward. How do you like your
change?”
“Why, I more than half like it; but there are some things I do not
like.—It is a fine thing to be so well off, and to know that I shall be so:
and I do not mind the work, though it is rather hard, to be sure; and
my cows are nothing but a credit to me, and I have seen no animals
to be afraid of when I go out milking, though some of them leap
about very strangely indeed; and my mistress makes much of me, as
I told you; and her little worries are not much to be wondered at
when one thinks of the confusion we live in just now; and I dare say
there will be an end of them when we get our soap and candles
made out of the house, and another hand or two to help in the
brewing and washing. And then to think that father and you are so
well off——”
“But tell me what there is that you do not like.”
Ellen almost shuddered when she whispered that her fellow
servant, who ate at the same table, and slept in the same room, and
was her companion almost all day, was a convict, and had been sent
to this country for robbing an aged mistress who had confided in her,
and deserved gratitude instead of treachery from her. To be
compelled to hold daily and hourly intercourse with such a person
was a very great evil, and one which doubled Frank’s anxiety about
his sister. He was glad to hear that there was a probability of the
woman marrying as soon as she could obtain a remission of her
servitude by steady conduct.
A half smile which he perceived on Ellen’s lips when this part of
the story was being told, made him question her further respecting
the evils of her situation, or the trials which she might not be
disposed to consider exactly as evils. The idea in her mind was that
which he suspected,—that she might quit her service before her
convict companion.—Frank looked graver than ever. Who—what—
where was he,—the person that seemed to have made advances in
Ellen’s good graces already? She was eager to explain that there
was no one in particular yet. It was too early for her to have looked
about and settled her mind yet;—but there was this one, and that
one, and the other one, that carried her pail for her, morning and
evening, however busy he might be; or was ready to teach her how
to clean and card wool; or showed her what a pretty little homestead
he was about to have in the neighbourhood, and intimated how
happy she might be as the mistress of it.
“They hinder my work sadly, and their own too,” continued she,
blushing, “for all I tell them that I have nothing to say to any body yet.
I am so afraid any of them should have been convicts, (though I am
sure Harry Moore never was;) and I dare not ask mistress any thing
about them.”
“Ask her, by all means,” said Frank. “Or I will ask your master, if
you wish it. They only can tell us, and it is a point we must find out.
Meantime, keep to your business as quietly as you can. What makes
you so sure that Moore (is not that his name?) was never a convict?”
Ellen could give no better reason than that she could wager her
life upon it. She thought her brother grown very pertinacious on a
sudden, because this was not perfectly satisfactory to him; but Frank
was not pertinacious—only wary and affectionate.
Chapter V.