File:Practical pathology; a manual for students and practitioners (1912) (14777820855).jpg

Identifier: practicalpatholo00woodrich (find matches)
Title: Practical pathology; a manual for students and practitioners
Year: 1912 (1910s)
Authors: Woodhead, German Sims, 1855-
Subjects: Pathology -- 1901-
Publisher: London, H. Frowde (etc.)
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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ressure may be graduated withextreme nicety, and the injection may be made to run very slowly.Ludwigs mercury pressure apparatus, or some modification of it, isusually employed; but Stirlings water pressure apparatus is perhapsat once the cheapest, the most readily made, and quite as convenientas any. It is constructed as follows:—Fit a large wide-mouthedbottle and a smaller one with corks. In the larger cork bore fourholes, and in the smaller one, two. Into two of the four holes inthe larger cork fit two straight tubes, one passing nearly to the bottomof the bottle, the other passing for a distance of half an inch onlythrough the cork. On this latter tube should be a stop-cock, andfitted above it a mercurial manometer by which the pressure is to bemeasured. This consists simply of a flattened (/(-shaped tube, one 54 PA THOLO GICA L HIS TO LOGY bend of which is filled with mercury, fixed to an index board markedoff in inches or centimetres. Into the other holes fit a couple of tubes
Text Appearing After Image:
Fig. 3. —Constant pressure apparatus as described. The fourth tube, withstop-cock for allowing ingress and egress of air, is not represented in the diagram. bent at right angles, each passing through the cork and projecting intothe bottle for about half an inch, one of them having a stop-cock onthe horizontal part of the tube. Into the two holes in the smaller CONSTANT PI^ESSURE INJECTING APPARATUS 55 cork are fitted bent tubes, one of which passes to the bottom of thebottle, the other passing in for only half an inch. A tin or glasscylinder holding a couple of pints or more of water, or a Winchesterquart bottle, fitted with the neck down into a large funnel, is suspendedfrom a pulley fixed to the ceiling of the room by a cord, by meansof which it can be raised or lowered at will. An indiarubber tubeis carried from the bottom of the cylinder, or of the funnel, to thestraight tube which passes to the bottom of the larger vessel. Insteadof the above, pressure from a water main may bepracticalpatholo00woodrich

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