File:An introduction to physiology (1906) (14595123237).jpg

Identifier: introductiontoph00port (find matches)
Title: An introduction to physiology
Year: 1906 (1900s)
Authors: Porter, William Townsend, 1862-1949
Subjects: Physiology Physiology
Publisher: Cambridge, Mass. : The University Press
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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Fig. 23. Non-polarizable electrodes ; abouttwo-fifths the actual size.1 the boots should be mounted on separate rods, toprevent the current passing through the unglazedboot to the metal holder and thus to the other boot.This difficulty is avoided by the rubber holders shownin Fig. 24. The electrodes may be mounted on abrass rod called the mounting-rod, or in the moistchamber shown in Fig. 24. The boot electrodesserve equally well for leading off the nerve or mus- 1 First described in Science, 1901, xiv, pp. 567-570. Thewell was added in Nov. 1905. STIMULATION OF MUSCLE AND NERVE 95 cle current to the electrometer arid for stimulation.After use, the boots should be emptied, rinsed intap water, drained, and placed in several hundredcubic centimetres of normal saline solution untilwanted again. If the foot of the hoot is kept saturatedwith normal saline solution these electrodes will remain
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Fig. 24. The moist chamber ; about three-fifths the actual size. non-polarizable. They may also be used with normalsaline clay. The Moist Chamber.1—The moist chamber (Fig.24) consists of a porcelain plate which bears near 1 Science, 1901, n. s. xiv, p. 569. 96 GENERAL PROPERTIES OF LIVING TISSUES the margin a shallow groove. In this groove rests aglass cover which for the sake of clearness has beenomitted from the figure. To the porcelain plate isscrewed a rod, by which the plate may be supportedon a stand. Within the glass cover are two right-angled rods. One of the rods carries a small clamp,composed of a split screw on which moves a nut, bymeans of which the femur of a nerve-muscle prepara-tion may be firmly grasped. The holder for the splitscrew is arranged to permit of motion in all directions.Both right-angled rods carry unpolarizable electrodes.Each of these is borne by a hard-rubber holder. Byturning the leg of the boot in the holder the foot maybe brought as near the foot o

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