New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . smograph(Fig. 72) consists of a casing (A), inclosing a rubber bulb(B). \Vlien the entire finger (dorsal surface in appositionwith the bulb) is introduced into the casing the straps (C),are fixed by buckles. Readjustment of the straps may benecessarv to secure maximum lexer oscillations. The SPHYGMOBIOMETER 279 amplitude of the latter varies and it is better to employ asubject in whom t
New concepts in diagnosis and treatment : physico-clinical medicine, the practical application of the electronic theory in the interpretation and treatment of disease, with an appendix on new scientific facts . smograph(Fig. 72) consists of a casing (A), inclosing a rubber bulb(B). \Vlien the entire finger (dorsal surface in appositionwith the bulb) is introduced into the casing the straps (C),are fixed by buckles. Readjustment of the straps may benecessarv to secure maximum lexer oscillations. The SPHYGMOBIOMETER 279 amplitude of the latter varies and it is better to employ asubject in whom the heart response to stimulation is , the more vigorous the lever oscillations the less isthe sensitivity of cardiac response. When it is impossible to obtain lever oscillations from thefinger pulse, the bulb (B) is removed from its casing and maybe fixed over the radial artery by a special contrivance(Fig. 72). In the latter instance, the response is not as sensi-tive as from the Fig. 72.—Plethysmograph. E, special contrivance for fixing the bulb(B) to the radial artery. Before tightening the straps (C), release stop cock (D)to avoid rupture of the rubber of the tambour (A, Fig. 71). When the straps are adjusted and the end of the tubingclosed by the stop cock (D), oscillations of the lc\ercommence. To maintain passivity of the finger, the latter and armmust rest on an unyielding leather cushion (placed on anothertable). Other exactions are noted on page 85. Next, secure maximum oscillations of the lever (B), hxraising or lowering the screw (D, Fig. 71). Then lower or 280 APPENDIX raise the tambour on the standard (C , Fig. 71) so that thelever approximates the platinum plate (C). By adjusting the screw (D) of the tambour or the otherscrew attached to the small post bearing the platinum plate(C^), just enough contact must be secured to elicit a faintbuzzing. If the contact is too close, the sensitivity of theapparatus is correspondingly diminished insom
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