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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... Sealing-Off of Lamp Chamber.--The hermetical sealing of a lamp chamber by fusing the glass while the lamp is still connected with the pumps. Search-light, Electric.--An apparatus which produces a.powerful stream of light and projects it in any direction, employing a focusing arc lamp, which, provided with large carbons, is enabled to use a heavy current; and the lamp is so situated as to project the greater part of the light onto a suitable reflector or lens, thereby concentrating the rays into one immense beam. Secondary.--A term applied to the secondary coil of a transformer or induction coil. Secondary Ampere Turns.--The ampere turns in the secondary coil of an induction coil or transformer. Secondary Battery.--A storage battery. Secondary Cell.--A storage cell. Secondary Clock.--A clock in a system of time telegraphy, whose movements are controlled by the current, regulated by the master clock. Secondary Coil of Transformer.--A transformer's coil which receives energy from the primary coil. The secondary winding of an induction coil or transformer. Secondary Currents.--Currents produced in a conductor by changes in currents in a contiguous conductor. The currents produced in the secondary circuit of an induction coil or alternating current converter. Secondary Fuse-Box.--A fuse-box placed in a transformer's secondary circuit or in that of an induction Secondary Plate of Condenser.--The plate of a condenser which becomes charged by reason of the existence of a charge in the opposite plate. Secret Telephone System.--A telephone system operated independent of an exchange or an attendant and arranged in such a manner as to enable persons to communicate with each other between any two stations without being heard by any other person on...