Thus the flint-drill, assisted by one of these powders, was quite adequate for perforating siliceous stones.
But they were not content, as heretofore, with merely perforating them with holes and hanging them in a string round their necks; they were now wrought with considerable care.
The foramina, or apertures perforating the walls of the skull, are very numerous, and may either be due to holes actually penetrating the bone, or may be small vacuities between the margins of two elsewhere contiguous bones.
The most dorsal of these, perforating the lachrymal bone, is the =lachrymal foramen= (fig.
Most of the numerous foraminaperforating the skull walls will be described after the bones have been dealt with.
What I have done is, I have made future controversy impossible, by exhibiting the animals at work, and by discovering the anatomy and the physiology of the perforating instruments.
When the two perforating shell-fish met and found themselves in each other's way, the stronger just bored right through the weaker Pholas.
What I did in 1851 was, I exhibited Pholades at work perforating rocks, and explained how they did it.
On returning to England last autumn I exhibited perforating Pholades to all the naturalists who cared to watch them.
I published a popular account of the perforating processes in "Household Words" in 1856.
Special machines for perforatingdesigns or for pleating materials are often needed in teaching the garment trades.
The next form of perforating machine introduced in later printings of the Crown and C.
Above this is a zone, about nine feet in height, where the marble has been pierced by a species of marine perforating bivalve--Lithodomus, Cuv.
The fact that its mouth is a mere clinging pore, deprived of any offensive weapon, would even lead me to believe that the grub is incapable of perforating the chrysalid's covering.
It goes on to say that the parasitic vermin inhabit the chrysalis, whence they make their way out by perforating the stout horny wrapper.
Perforating ulcer of the foot is a rare disease, consisting of an indolent and usually painless sinus leading down to diseased bone.
The enlargement of the anteriorperforating veins is an old symptom of chronic glaucoma.
The method of perforating employed is a usual one with small shells of this form.
Bone pins are generally headless, and have in most cases been intended as implements for perforating and for sewing.
The grinding down and the perforating of natural shells is easily accomplished, so that any savage could afford to decorate his person with this jewelry in profusion.
Bouginage of a malignant esophagus to increase temporarily the size of the stenosed lumen is of questionable advisability, and is attended with the great risk of perforating the weakened esophageal wall.
Mandrins are obtainable, but their use is objectionable for a number of reasons, chief of which is the danger of overriding a foreign body or a lesion, or of perforating a lesion, or even the normal esophageal wall.
Sarcoma and carcinoma of the thyroid when perforating the trachea may become pedunculated.
The longer the slant, with consequent acuting of the angle, the more the introduction is facilitated; but too acute an angle increases the risk of perforating the esophageal wall, and necessitates the utmost caution.
The mandibles of the larvae are of great strength, and are even capable of perforating lead.
They make their nests in the trunks of old trees, perforating the sound wood to arrive at the heart, which is rotten, or hollowing for themselves a hole, which they clear out by the gallery which leads to it.
A further structure, best developed in the Lacertilia, appears in the form of a circular passage perforating the blastoderm at the front end of the primitive streak (fig.
There appears to be a pore perforating the inner layer at the formative pole, which may be called a micropyle (Kupffer and Benecke, No.
The fibrous column breaks up into a number of strands perforating the lumen of the organ, and the cells of the wall become stalked bodies projecting into the lumen.
C represents this plate and four others placed between two layers of canvas, cloth, or other material with the stud heads perforating one of the layers and the plates overlapping like slates upon a roof.
Perforating is only practiced by a small number of species of insects, and many but not all of the perforators do so because their tongues are too short to reach the nectar by entering the flower.
What insects do to promote the propagation of plants byperforating the flowers in search of honey.
In perforating wounds, the tube or several tubes, when the wound is large, are passed through from both sides, or pushed into cavities or pockets that may exist.
If the wound is not a perforating wound, but a deep wound, the tubes are planted deep into the cavity that may be formed.
It often happens that in the interval between the deposition of two sets of unconformable strata, the inferior rock has not only been denuded, but drilled by perforating shells.
These fragments have often adhering shells attached to them, and have been bored by perforating mollusca.
Such pebbles are frequent at Pontlevoy on the Cher, with hollows drilled in them in which the perforating marine shells of the Falunian period still remain.
Again, it was necessary in this time to make the detailed studies not only of the tunnel itself, but of the compressing and perforating machinery on the large scale proposed to be used.
This done, the main line is {70} prolonged to the requisite distance, and the perforating engine is again brought forward for a fresh attack.
Corroborative evidence of the influence of elasticity in the prevention of starring is seen in the limited nature of the comminution of the ribs in cases of perforating wounds of the thorax.
Perforating the skull in the centre of its course.
In others the bullet passed longitudinally through the thorax, grooving or perforating one or more centra.
I will here quote one case of interest as completing the various forms of perforating wound of the abdomen met with during the campaign.
Thus I occasionally observed more troublesome results from minor shell wounds in the neighbourhood of joints, but not implicating the synovial cavity, than in actual perforatinginjuries produced by bullets of small calibre.
As to perforating wounds of the transverse colon and small intestine, I believe spontaneous recovery to be very rare.
Perforating Fracture of Frontal Bone from within Separation of plate outer table.
The lesser are best designated as gutter fractures, the deeper are perforating and gradually approximate themselves to the type of injury described as class 1.
Complete perforating tracks through the articular ends of the bones, crossing the joint cavity in various directions.
Glancing or oblique perforating wounds of varying depth in any portion of the cranium.
The larger fragments of such shells were responsible for the most serious mutilating injuries, while small fragments sometimes caused comparatively simple perforating wounds.
This form is of little practical importance, as the velocity retained by the bullet is low, and no perforating power would be retained.
At first sight it might appear that the depressions had been made |141| with the view of perforating the blade, so as to make it like Fig.
Gladsden judged this an excellent opportunity to kill two birds with one bullet, on the expectation of the missile perforating the foremost and then burying itself in his comrade.
The one, three, five, ten and twelve cent values were first made by perforating sheets from the original plates, and later, certain changes were made that require to be noticed.
In many cases indistinct dots can be seen where the perforating machine failed to do its work.
The perforating action of capped armour-piercing projectiles is even better shown in fig.
The fourth round was capable of perforating 22 in.
In the case of the perforating action of capped projectiles, on the other hand, the ratio of d and t does not appear to affect the F.
A stout and rigid backing evidently assists a plate very much more against this class of attack than against the perforating attack of a capped shot.
The first stage is theperforating machine, through which all films, whether negative or positive, must go.
There are several different perforating machines in use now, and all of them are claimed by their makers to be perfect.
The films unwind from one bobbin, pass through the perforating device, and wind upon another bobbin.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "perforating" in a variety of sentences. We hope that you will now be able to make sentences using this word.
