COLLOIDS--BROWNIAN MOVEMENT AND ELECTRICAL TRANSPORT
Description
The original catalog description provided by the Ford Motor Company reads as follows: Captions: “The minute particles floating in a liquid or gas are animated by a constant and intense movement which has been carefully studied by Brown. Colloidal particles examined through an ultra-microscope show clearly these movements. Colloidal gamboge.” “Particles of colloidal silver.” “Larger amplification. The width of the screen represents 14-thousandths of an inch.” “Electrical transport -- Colloidal particles are electrically charged. In an electric field the particles go to the (+) positive pole to the (-) negative, according to the kind of charge. Therefore the direction of the transfer changes when the current is reversed.” “To appreciate the speed of the Brownian Movement and of the electrical transfer we have caused a modification in lighting every two seconds.” “Brownian Movements of tobacco smoke floating in the air -- the small cross appears at intervals representing one second.” “Electrical transfer of the smoke. The signs (+) positive and (-) negative indicate the anode and the cathode.” [1925]
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