A manual of practical medical electricity - the Röntgen rays and Finsen light (1902) (14803541703)

Identifier: manualofpractica00turn (find matches)

Title: A manual of practical medical electricity : the Röntgen rays and Finsen light

Year: 1902 (1900s)

Authors: Turner, Dawson

Subjects: X-Rays Electrophysiology Electrosurgery Electric Stimulation Therapy Electrotherapeutics X-rays Electrophysiology Electrosurgery

Publisher: New York : William Wood & Company

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

ch it may be united. The following is a list of the commoner elementarysubstances arranged in an electro-chemical series. Electro-negative. Electro-positive. Oxygen. Hydrogen. Fluorine. Gold. Sulphur. Platinum. Nitrogen. Silver. Chlorine. Mercury. Bromine. Copper. Iodine. Iron. Phosphorus. Zinc. Arsenic. Manganese. Carbon. Magnesium. Silicon. Calcium. Barium. Sodium. Potassium. Csesium. 170 A Manual of Practical Medical Electricity Each of these is electro-negative to the one following it,but electro-positive to the one preceding it. Fig. 96 is a diagram of a galvanic and of an electrolyticcell to represent the relation of the poles to each other.The wire which starts from the positive pole (copper) ofthe galvanic cell is attached to the anode of the electrolyticcell, and the kathode of the latter is attached to thenegative pole or zinc of the galvanic cell. In the electro-lysis of acidulated water with platinum electrodes theoxygen atoms, being charged with negative electricity, POLE

Text Appearing After Image:

Zn GALVANIC Cu CELL. + Anode Kal-hode ELECTROLYTIC CELL. Fig. 96.—Galvanic Cell coupled to Electrolytic Cell. are attracted to the positively charged anode, while thehydrogen atoms, being charged positively, are attractedto the negatively charged kathode ; hence the hydrogenalways goes down, or in the direction of the current.Faradays three laws of electrolysis may be stated asfollows : 1. The electrolytic action of a current is equal at allpoints of a circuit. 2. The amount of gas liberated in a given time isproportional to the average current-strength during that Electro-Physiology 171 time (thus 2 amperes will liberate twice as much gas asI ampere). 3. When the same current acts on many electrolytes,the weights of the elements separated by electrolysis arein proportion to the chemical equivalents of these ele-ments. The chemical equivalent of an element is obtained bydividing its atomic weight by its valency. Thus, if wedivide the atomic weight (16) of oxygen by its valency (2),w

a manual of practical medical electricity book illustrations medicine medical illustrations medical history history of technology electric power electricity x ray röntgen medical therapy electrotherapeutics images from internet archive

1902

Open Knowledge Commons and Harvard Medical School

http://commons.wikimedia.org/

public domain