. Electro-physiology. Electrophysiology. B-10 BRUBAKER. out to a tine capillary point. 'I'lie tube is filled with niercuiy and its capillary point immersed in a 10-per-cent. solution of sulphuric acid. The vessel containing the acid is filled to the exteiit of several millime- tres with mercury also. The mercury in the tube is put in connection with a platinum wire (a), and the acid in the vessel with a second wire (6), When a constant current passes into the apparatus in the direction from 6 to a the mercury is pushed up the tube, and, upon the breaking of the current, it may or may not retur
. Electro-physiology. Electrophysiology. B-10 BRUBAKER. out to a tine capillary point. 'I'lie tube is filled with niercuiy and its capillary point immersed in a 10-per-cent. solution of sulphuric acid. The vessel containing the acid is filled to the exteiit of several millime- tres with mercury also. The mercury in the tube is put in connection with a platinum wire (a), and the acid in the vessel with a second wire (6), When a constant current passes into the apparatus in the direction from 6 to a the mercury is pushed up the tube, and, upon the breaking of the current, it may or may not return to the zero-point. For the purjiose of measuring in millimetres of mercury the pressure necessary to compensate this change in the capillary constant produced by the elec- tro-motive force of polarization, the apparatus is provided with a pressure- vessel, H, and a manometer, B. This electrometer can be applied to any. Fig. 5.—Capillary Electrometer. microscope having a reversible stage. The oscillations of the mercury can then be observed with the microscope provided with an ocular microme- ter. The special advantage of the electrometer is, that it will respond instantly to any variation in the electro-motive force, and indicate a dif- ference of potential, according to Lippmann's observation, as slight as t*'^ T5^?TT of a Daniell. These rapid oscillations can be recorded by photographic methods. Electrodes.—It is essential, in the detection of weak electrical cur- rents with highly-sensitive galvanometers, that the electrodes, which are placed in contact with the tissues, should not only be absolutely homo- geneous, as the slightest diflference between them will develop a current upon the closure of the circuit, but that they should also be incapable. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original B
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectro, bookyear1894
