[D8627W1], Test Report, Henry E Walter, Edison Machine Works, June 7th, 1886


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[D8627W1], Test Report, Henry E Walter, Edison Machine Works, June 7th, 1886

Editor's Notes

Test report titled Method of Working Quadruplex Instruments on a Single Dynamo Machine. ##The dynamo is made for twice the maximum Volts for any line, and the current is put through[?] a bank of lamps with the ground in the middle. The two poles are taken equally distant (in volts) from the ground, and since one pole is always to ground the lamps (a), of which there are 8 (for 300 volts) are lighted to ground and that part of the system (- side) is lost. The other lamps a1, go to the split key which in this arrangement when up[?] puts lamps a1 to ground also, but through[?] 500 ohms and since the lamps (a1) are about 1300 ohms, the potential at the split key is 500/1300 + 500 of the total available Volts, or about 1/4a. When this 500 ohms is broken from the ground (split key down), the full volts or 300 in this case goes over the line. Whether (a1) or (a) lamps are to ground (a) or (a1), splits this key (2). Key [----------].



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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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