Medical electricity : a practical handbook for students and practitioners / by W.E. Steavenson and H. Lewis Jones.

Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Medical electricity : a practical handbook for students and practitioners / by W.E. Steavenson and H. Lewis Jones. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    closing and opening the circuit while in use, these are sometimes so badly designed as to add much to the difficulties of the operation. The figure (fig. 94) shows the usual form of handle, known as Schech's. Fig. 94.—Schech's handle. The shorter handles are more convenient than the large size, which is more expensive, and too unwieldly for delicate manipulations. If the cautery mounts are too slender, they will be- come heated. They are insulated by a thick waxed thread twisted round them in racking turns, which keeps them from touching, although binding them together, and forms a sufficient means of insulation, except when they become overheated. Fig. 95.—Cautery for larger incandescent surface. Besides the simple platinum loops, cutting instru- ments of various shapes are made by hammering the platinum flat or by bending it in various ways. Where a larger incandescent surface is required, a loop or spiral of platinum supported in grooves on a porcelain mount is made, the porcelain then becomes heated to redness as well as the platinum (see fig. 95]. Different thick-