London: Bemrose & Sons Ltd., Printers 1902. VI, 201 pages. 8vo. Publisher's blue cloth with black embossed titles and decorations. Boards worn and soiled, corners bumped. Original yellow endpapers (cracked but holding). Paper uniformly browned especially at the edges. Well read, binding is loose. Fair. Cloth. 
The first 66 pages of this work talk about what these instruments are and how to use them. The balance of the work is far more interesting historically, being a detailed well illustrated catalog with prices of K. Schall's Electro-Medical Apparatus. The binding on this volume was poorly conceived, and although this is the hardcover edition (most are thin stiff paper boards) it nonetheless has a feeling of fragility. Then again we've been happily flipping through it for 15 minutes and it is great fun (and hasn't fallen apart!).
This is the Eighth edition from 1902. The later catalogues (circa 1920s) are far more common from this manufacturer.