. American telephone practice . FIG. 62.—TRANSMITTER MOUNTED ON ARM. appreciable effect one way or another on the quality of the trans-mission. Only a few series of experiments are on record from reliablesources giving the results of comparative tests between inductioncoils of various dimensions. It may be said that definite results fromany such series of tests are hard to get, as the quality and loudness. FIG. 63.—INDUCTION COIL IN BASE OF ARM. of transmission is subject to more or less personal error, even in thecase of experienced experimenters. A series of experiments, cited by Preece and
. American telephone practice . FIG. 62.—TRANSMITTER MOUNTED ON ARM. appreciable effect one way or another on the quality of the trans-mission. Only a few series of experiments are on record from reliablesources giving the results of comparative tests between inductioncoils of various dimensions. It may be said that definite results fromany such series of tests are hard to get, as the quality and loudness. FIG. 63.—INDUCTION COIL IN BASE OF ARM. of transmission is subject to more or less personal error, even in thecase of experienced experimenters. A series of experiments, cited by Preece and Sttibbs and per-formed by the adminstration of the Swiss telephone department,is of interest. In this test a o-ood Blake transmitter was used INDUCTION COILS. 79 throughout, the object being to determine the best of a set of ten in-duction coils. Table I. gives the most important data concerningthe primary and secondary windings of each coil. TABLE I. Ppimary Winding. SecondaryWinding. Results for Various Lengths of Line. o * t/3 ui 5j=Ocu wi wiB O V u 31 mile 38 miles 49 miles 53 miles. 67 miles o o 3°1 .2 3 •si H >> % >. M >> i >. ai £ M 3 is 1* 5! 1* (A i/i 8 c ui a V a in c an mCV Su uicu c u A £ « £ z « .3 o .9 .9 .3 ° .7 .7 .2 u 61 24 .25 1956 35 100 .9 2_. 62 24 .25 3191 15 180 .7 .9 .9 .7 10 • 62 24 .25 4080 35 250 .9 .9 10 1
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
