Apparatus and methods for measuring electric waves . ass vessel about 12 cm. in height, about 15 cm. indiameter is fastened to a cast iron base by means of a glass rodabout 3 cm. in diameter and about 25 cm. high. The primary coilis made in tv/o pieces with small brass balls at one end of eachhalf, the diameter of this coil which is of one turn, is about10 cm. in diameter and the wire diameter of which it is made isabout 2 mm. The secondary is a continuation of the parallelwires into the side of the glass vessel and bent into nearly acomplete circle with the diameter the same as the primary. T
Apparatus and methods for measuring electric waves . ass vessel about 12 cm. in height, about 15 cm. indiameter is fastened to a cast iron base by means of a glass rodabout 3 cm. in diameter and about 25 cm. high. The primary coilis made in tv/o pieces with small brass balls at one end of eachhalf, the diameter of this coil which is of one turn, is about10 cm. in diameter and the wire diameter of which it is made isabout 2 mm. The secondary is a continuation of the parallelwires into the side of the glass vessel and bent into nearly acomplete circle with the diameter the same as the primary. Theprimary is placed on top of the secondary. Between the primaryand secondary is placed a mica disc, the diameter of which is thesame as the glass vessel. A hard rubber lid is placed on theglass vessel thru which connections from the primary are broughtwhere they may be connected to the induction coll terminals. Thevessel is then filled with heavy oil. TThen oscillations are pro-duced in the oscillating circuit, which vilU. be described below. 20 I. the OGcillatlons produce periodic currents in the primary v/liichexcite induced currents of the same period in the secondary orparallel wires. The connections of the oscillatinc circuit areshow-n in Fig. 8, page28,C, is a capacity, G, a spark gap, T, aTesla transformer, E, the primary of the oscillator. This appar-atus gives waves about 110 en. in length. The manipulation isthe sane as in the other methods described except that no vacuumtubes need be used in a sufficiently dark room. I 22
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1906
