Indican
in chemistry, C26H31NO27, a clear brown syrup of bitter and repulsive taste, existing in many species of plants, but especially in Dyer's wood (Isatis tinctoria). Indican is sometimes found in the urine of man, both in health and disease. It has also been found in the blood of man and in the blood and urine of the ox. used in volumetric analysis to indicate, by change of color, the exact point at body from a solution is completed. Indi- 1 INDICTION cators are also used to determine, by change of color, the precise point at which a liquid ceases to be either acid or alkaline. The chief reagents used as indicators are yellow potassic chromate, potassic ferrocyanide, indigo, carmine, litmus, turmeric, Porrier's orange, tropœolin, phenolphthalein, eosin, rosalic acid, etc.
An instrument for measuring the horse power of a steam engine.
Optics. A finger working in the field of a microscope to point out a special object within the field of view. Telegraphy. The dial and mechanism of a dial telegraph. The face has the letters and figures arranged in two concentric circles. The motion of the hand is continuous in one direction advancing one letter at each closing of the circuit.
The movement is effected by clockwork driving a scapewheel, the teeth of which are alternately engaged and released upon opening and closing the circuit, by means of a pawl operated intermediately from the armature of the electro-magnets.