File:Exercises in practical physiology (1897) (14764549592).jpg

Identifier: exercisesinpract00wall (find matches)
Title: Exercises in practical physiology
Year: 1897 (1890s)
Authors: Waller, Augustus Désiré, 1856-1922
Subjects: Physiology Biochemistry
Publisher: London New York, N.Y. Bombay : Longmans, Green, and Co.
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
h of the two nervesacross a pair of electrodes. Wait till the galvanometer spot issteady. Now tetanise one of the muscles for, say one minute, andwatch the spot for the next few minutes ; it should move in adirection indicating greater heat of the contracting muscle. After a short interval, turn the commutator so that theother nerve shall be excited when the key in the secondary cir-cuit is raised. Repeat the excitation on that side and watchthe spot, which should move in the opposite direction to itsmovement in the first experiment, indicating however, asbefore, greater heat of contracting muscle. N.B.—The galvanometer, and all other terminals, shouldbe protected from draughts of air by wadding, to guard againstaccidental effects of temperature changes at adventitiousjunctions of dissimilar metals. IN THE PHYSIOLOGY OF THE NERVOUS SYSTEM. B.— With the Normal Muscles of a Man. Dem. 81 Apparatus and preparations.—Air thermometer or thermo-graph. Dynamograph. Gell, coil, and keys.
Text Appearing After Image:
The essential part of the apparatus is a hollow metal cap-sule, to be strapped to the muscles of the forearm or other part,in air-communication through a flexible tube with an indicator.Two forms of indicator may be used:—6 32t; ;v/.,.;BX3BR0ISES. AND.-DEMONSTRATIONS: . (1) For the purpose of denionstration, a small water-mano-meter in wMcii the level of water caii be watched directly, orprojeotisd on a screen, by placing the manometer in*: the magiclantern. , :■ . (2) For the purpose of recording the variations, a piston-recorder, the lever of which is adjusted above that of thedynamograph, ,on the same cylinder. Whichever form of indicator be adopted, it should begraduated in tenths of a degree, by immersing the capsulein a vessel of cooling water by the side of a mercury ther-mometer. When the apparatus is first applied to the skin it should beleft in situ, with the side tap open until it is in temperatureequilibrium. This is known by the lever or manometer re-maining stationar

Note About Images