An essay on the history of electrotherapy and diagnosis; . SchalPs Leiters urethroscope. process difficult. Among the earlier workers who attackedthe problem of the photography of the living fundus, wereBagneris, Guilloz, Gerloff, and notably Dimmer whoseresults were usually excellent. A little later, Thorner and HISTORY OF ELECTROTHERAPY 127 Wolff, though adopting a different method, obtained photo-graphs which were nearly as good as those of Dimmer. Themain objection to Dimmers process is the elaborate and costlyapparatus which is necessary, and which, moreover, needsskilled
An essay on the history of electrotherapy and diagnosis; . SchalPs Leiters urethroscope. process difficult. Among the earlier workers who attackedthe problem of the photography of the living fundus, wereBagneris, Guilloz, Gerloff, and notably Dimmer whoseresults were usually excellent. A little later, Thorner and HISTORY OF ELECTROTHERAPY 127 Wolff, though adopting a different method, obtained photo-graphs which were nearly as good as those of Dimmer. Themain objection to Dimmers process is the elaborate and costlyapparatus which is necessary, and which, moreover, needsskilled assistance in its use, and also takes up a considerableamount of Professor Wertheim Salomonsons first photographic apparatus. The various conditions necessary for eliminating the con-fusing series of reflections were formulated by Gullstrand, andwere then embodied in the large demonstration ophthalmoscopeof Zeiss, which was, however, unsuitable for photographicwork. Owing to the researches of Wertheim Salomonson, ofAmsterdam, the various difficulties have been overcome, andbeautiful photographs of the fundus oculi in the living subjectcan now be obtained by his apparatus, a general description ofwhich he published in April, 1917, while a more extended 128 AN ESSAY ON THE account appeared in 1919. It would be foreign to ourpurpose to discuss at length the optical principles involved ;these will be found set forth at length in the second of the twomemoirs to which we have just referred. By the kindness
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1922
