File:An Oscillographic investigation of current and EMF- waves of telephone magneto generators (1907) (14569736380).jpg

Identifier: oscillographicin00morr (find matches)
Title: An Oscillographic investigation of current and EMF- waves of telephone magneto generators
Year: 1907 (1900s)
Authors: Morrison, Rudolph A Lurvey, David Reker, William
Subjects:
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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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nger and condenser together in thecircuit,the E.M.F, is increased,while for a condenser eJionein circuit the E.M.F.is even greater than the no loadvoltage of the generator. By increasing the number ofringers or condensers in the circuit,there is not much of avariation produced in the E.M..?, TABLE #6 Effective E.M.P. for each load measuredwith Weston voltmeter Generaror #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 No Load 80 77 80 80 68 82/5 31 59 73 66.5 R 52 57 80 53 68 82 81 40 73 66 B, 35 42 36 36 33 38 38 26 31 34 Bg. 34 41 35 36 32 37 37 25 30 33 B3 33 40 34 35 31 36 36 24 29 32 -S>A 32 40 33 34 30 35 35 24 28 31 c, 91 86 89 87 75 91 87 64 81 75 Cg 88 87 85 86 74 90 37 65 77 75 c^ 88 85 82 86 72 88 90 65 79 72 c^ 92 82 83 87 73 89 93 66 82 71 B, C, 78 75 75 73 6e> 81 81 60 71 64 B.C^ 71 70 68 71 60 73 75 52 64 60 B^C, 66 67 62 65 55 67 68 47 58 56 B^C* 61 64 58 61 52 62 64 44 54 53 B,C2. 80 75 74 79 66 80 84 59 73 63 B,Cj 82 74 73 78 66 79 86 57 72 63 B, C4 79 73 69 74 62 76 84 53 68 61
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Oscillographic stud^^ Of Current Waves*The general Electric Oscillograph was used.The apparatusconsists of an electro maignetic galvanometer with movingmirror of extremely high period and Euitf.bly dsmped,a box in vaiich the galvanometer with the necessary lenses,mirror^, prisms, and shutter for controlling light are placed.An axe light furnislied the beam of light for the galvanometermirrors.The moving elements or vibrators ar^; single loops offlat v/ire held in tension by a small spiral spring,A smallmirror is attached to the strips,the vibrs.tors are slid inthe chambers between the poles of the magnets* The waves can either bepliotograi-uied or traced.Por thelater method,the one used there is provided a tracing table,on v/h,ich a piece of transparent paper is plo,ced and a tracing mmade of the observed wave.In this case the v/ave must bestationarj,otherwise it would be impossible to trace it.The waves can be made stionary by either electrical ormechanical means.Por large alternator

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