Determination of current and candle power curves of the alternating current arc under impressed voltage of various wave forms (1905) (14591221239)

Identifier: determinationofc00bras (find matches)
Title: Determination of current and candle power curves of the alternating current arc under impressed voltage of various wave forms
Year: 1905 (1900s)
Authors: Brashares, H. E Armstrong, J. R
Subjects:
Publisher:
Contributing Library: Paul V. Galvin Library, Illinois Institute of Technology
Digitizing Sponsor: CARLI: Consortium of Academic and Research Libraries in Illinois



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ctionand obtain a condition which more accurately representsaoi average effect of the arc, a special machine is used.Vhit nit chine, es shov.r ir Print 1, was designed by Prof.Snow of the Armour Institute of Technologj;^, and built inthe Institute shops under the direction of Mr. Sommers.At the beginning of this work, it was altered in some re-spects, chief of which was the support of the lower car-bon. This alteration was m6.de to eliminate the shadowsproduced by the supports as much as possible. The mainpurpose of the machine is to rotate the arc a.^ a highspeed and thus eliminate the effects of its wandering. The machine consists of a suitable v/rought ironframe, a, v/hich supports the cast iron ?/heel, b, at itscentral point, c. This ?;heel is graduated on its backside in degrees from zero to ninety in each directionfrom d, which represents the zero or vertical positionof the arc. The wheel, b, carries the white metal frame,e, which is secured rigidly to it. The frame, e, supports
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PRIET 1. 12 the meohanism for adjusting and rotating the carbone.The upper- carhon is supported on the Iod-, f, wjiichpasses through the sleeve, g, through6ut its entirelength and is -secured to it by a feather.key which permitsof easy movement up or down, by the thumb .screw, k, v/hilethe key insures rotation with the sleeve. Upon sleeve,g, and insulated from it is the second sleeve, i, whichBupiOrts the lower carbon. The brush, j, serves to con-nect the lower carbon with the binding post, o, whichis connected to the line. The other terminal of theline is connected to the binding post, n, v/hich makesconnections with the upper carbon through the frame, e,and the sleeve, g. Keyed to sleeve, g, is the pulley,m, which is driven by a belt running over two small idlerpulleys in the back of the frame to the shaft of the smc:.llCrocker-lVheeler motor, q.. The shaft of this motor isin line with the horizontal axis of the wheel, b, v/hichpermits of three movements of b about its axis withoutd