A text-book of physiology, for medical students and physicians . Fig. 40.—Diagram of struc-ture of the dArsonval galvanom-eter, c is the coil of fine wirethrough which the current ispassed. It is swung by a finethread of phosphor-bronze so asto lie between and close to thepoles—in) north pole, and (s)south pole—of the magnet. Justabove the magnet the thread car-ries a mica or aluminum vane towhich is attached a small scale of the instrument is re-flected in this mirror and isobserved through the telescopeshown in Fig. Fig. 41.—Schema of capillary electrometerarranged to show th
A text-book of physiology, for medical students and physicians . Fig. 40.—Diagram of struc-ture of the dArsonval galvanom-eter, c is the coil of fine wirethrough which the current ispassed. It is swung by a finethread of phosphor-bronze so asto lie between and close to thepoles—in) north pole, and (s)south pole—of the magnet. Justabove the magnet the thread car-ries a mica or aluminum vane towhich is attached a small scale of the instrument is re-flected in this mirror and isobserved through the telescopeshown in Fig. Fig. 41.—Schema of capillary electrometerarranged to show the demarcation current inmuscle {Lombard): a. The glass tube containingmercury and drawn to a fine capillary below; c,the receptacle containing mercury by raising?which the mercury can be driven into the capil-lary of a; f, a vessel with glass sides containingmercury below, and above dilute sulphuric acidinto which the capillary of a dips; E, the micro-cope for observing the mercury thread in thecapillary; m, the muscle; g and h, the wirestouching the longitudinal and cut surfaces of themuscle. The current flows as indicated by thesmall arrows; d, the capillary thread of mercuryas seen under the microscope. the system comes quickly to rest with few or no oscillations. If the coil of wirecontains sufficient turns, enough to give a total resistance of two to threethousand ohms, and the poles of the magnet are brought very close to thecoil, the instrument may be given a delicacy sufficient to study accurately themuscle and ne
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