The trepan is now disused, and the trephines best suited to the purpose are those fluted on the side of the crown, with the perforator made to slide and fix by means of a proper screw.
In former times, the operation of trepan was performed frequently, and many seemed to rate the dexterity and science of a surgeon by the number of holes which he was able to bore in the skull of an unfortunate patient.
The resistance to an effort of torsion need not, however, be much dwelt on, for the turn given to the trepan is always made when the tool is lifted up from its bed.
In some cases where the rock is hard, three sizes of trepan are used consecutively, the sizes being 5 feet, 8 feet, and 13 feet.
The teeth of the large trepan are not horizontal, but are deeper towards the inside of the pit, the face of the inside tooth being 3-3/4 inches lower than the outside.
The small trepan cuts a hole 4 feet 8-3/4 inches in diameter, and has fourteen teeth, fitted in cylindrical holes and secured by pins entering through circular slots.
Illustration: Connections to the Trepanand Spears or Rods.
At a distance of 4 feet 4 inches above the main teeth of the trepan there is an arm, with a tooth at each end.
In sinking the well of Passy, the weight of the trepan for comminuting the rock was about 1 ton 16 cwt.
The hole made by the smalltrepan is not kept at any fixed distance in advance of the full-sized pit, but the distance generally varies from 10 to 30 yards.
The maximum speed of the larger trepan may be taken at about 3 feet a day.
I promised him five hundred guineas to trepan him.
Now, the trepan is the only way to effect it; and I'll be frank with you: Doctor Pell has been with him half a dozen times, and he says the operation would be instantaneously fatal.
Well, suppose there's a hundred chances to one the trepan kills him on the spot--what then?
Twas agreed on all hands the trepan would be certain death.
But, though Pell pronounced that he must die without recovering consciousness, and that the trepan would kill him instantaneously, I had a profound misgiving that he might recover speech and recollection.
Twas instantly stifled, however; and when Dillon turned his flaming eyes upon him, the little doctor made him a bow of superlative gravity, which the furious hero of the trepan was too full of his wrongs to notice in any way.
James Mhor Drummond was secretly applied to to trepan Stewart to the sea-coast, and bring him over to Britain, to almost certain death.
And I hae as little doubt that the poor deevil Morris, whom he could gar believe onything, was egged on by him, and some of the Lowland gentry, totrepan me in the gate he tried to do.
He must also often lift up the Trepan to search the Hole, to cleanse the Instrument, and to keep {212} it from growing hot.
What is requisite to be done in a doubtful Occasion; Must the Trepan be apply'd or omitted?
As often as the Trepan is taken off, let him search with a Feather, to see whether the Bone be cut equally; and if it be not, he must lean more on that side which is least cut.
A double Trepan is to be made, and apply'd on each side of the Suture, by reason of the overflowing of the Blood, which may happen therein.
What is that deep Fracture, wherein the use of the Trepan is absolutely necessary?
This practice of kidnapping induces me to think, that, notwithstanding all our strictness, their principal business among us was to trepan our people.
In the treatment of such fissures he directs that the scalp wound be enlarged, the cranium perforated very cautiously with a trepan (trepano) at each extremity of the fissure and the two openings then connected by a chisel (spata?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "trepan" in a variety of sentences. We hope that you will now be able to make sentences using this word.
