File:Electric engineering. (1902) (14797387963).jpg

Identifier: electricengineer03inte (find matches)
Title: (Electric engineering.)
Year: 1902 (1900s)
Authors: International Library of Technology
Subjects: Electrical engineering
Publisher: Scranton, International Textbook Co.
Contributing Library: UMass Amherst Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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enter piece /, the twobrass pieces being separatedby means of a porcelainpiece c. When the lamp isscrewed into the socket, thescrew shell makes one con-nection and the center piecethe other. Fig. 8 shows alamp screwed into an ordi-nary Edison key socket. Fig. 7 (&) shows the T. H.base, so called because itwas brought out by theThomson - Houston Compa-ny. In this base, one ter-minal is connected to a centerbrass piece t in which a holeis drilled and tapped. Theother terminal is connected to the brass ring t(. This basehas the advantage that the outer shell, if one is used, is inno way connected to the circuit, and there is, therefore, lessdanger of receiving a shock by touching the lamp; it hasbeen, and still is, used to a considerable extent, though it isgradually going out of use, as it is more expensive to makethan the Edison base. It works loose in the socket a littlemore easily than the Edison base when the lamp is sub-jected to vibration. When placed in the socket, terminal t
Text Appearing After Image:
Pig. 8. n ELECTRIC LIGHTING. 16 screws on a projecting stud, thus making one connec-tion; the other connection is made by the ring f com-ing into contact with a corresponding ring or terminalin the socket. The later types of T. H. base are madeof porcelain with a brass center piece and outside ring, asdescribed above. Fig. 7 (c) shows the Westing-house base, or the Sawyer-Man base, as it is sometimes called, because it was orig-inally brought out by The Sawyer-Man Company. Thisbase is similar in some respects to the Edison, but theouter shell is not threaded; the lamp is pushed intothe socket, the outer shell slipping into a split bushingthat is provided with an annular groove. The rib dslips into this groove when the lamp is in position andprevents the lamp slipping out. The other connectionis made by the projecting pin t coming into contact witha spring in the socket. This base has the fault that itsometimes allows the lamp to drop out of the socket ifthe split bushing does not grip

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