Section 57
No. 57. Description of a Syringe.
THE instrument called a pyulcus acts on the same principle. A hollow
tube, of some length, is made, A B (fig. 57); into this another
tube, CD, is nicely fitted, to the extremity C of which
is fastened a small plate or piston, and at D is a handle, E F.
Cover the orifice A of the tube A B with a plate in which an extremely
fine tube, G H, is fixed, its bore communicating with A B through the
plate. When we desire to draw forth any pus we mus't apply the extreme
orifice of the small tube, H, to the part in which the matter is, and
draw the tube C D outwards by means of the handle. As a vacuum is thus
produced in A B something else must enter to fill it, and as there is no
other passage but through the mouth of the small tube, we shall of
necessity draw up through this any fluid that may be near. Again, when
we wish to inject any liquid, we place it in the tube A B, and, taking
hold of E F, depress the tube C D, and force down the liquid until we
think the injection is effected.
Section 58.
Index.