. Electrical world. rodes than when supplemented by the spring spider. The Strombcrg-Carlson Company is the assignee of this transmitter. AUTOMATIC EXCHANGE. A patent has been recently granted to F. A. Sundquist, of Chicago,for an automatic telephone exchange which is in the nature of animprovement on a system previously patented by him. The switch-board is designed for large systems involving auxiliary switchingprocesses. All parts seem to be well worked out, and the circuits andapparatus comparatively simple. This system has the merit that thework required of subscribers is of a simple natur
. Electrical world. rodes than when supplemented by the spring spider. The Strombcrg-Carlson Company is the assignee of this transmitter. AUTOMATIC EXCHANGE. A patent has been recently granted to F. A. Sundquist, of Chicago,for an automatic telephone exchange which is in the nature of animprovement on a system previously patented by him. The switch-board is designed for large systems involving auxiliary switchingprocesses. All parts seem to be well worked out, and the circuits andapparatus comparatively simple. This system has the merit that thework required of subscribers is of a simple nature, and it seems tocompare well with existing apparently successful systems. TELEPHONE WALL SET. .\ new arrangement of apparatus box for telephone wall sets isthe subject of a patent issued to E. B. Fahnestock, of New novelty lies in an arrangement of the hinge of the swinging frontsuch as to permit of the condenser of the set being slipped out ofthe box between the cover and the back board through the hinge. FIG. 2.—GOLDBERG TRANSMITTER. consists of two spring spiders, one to hold the diaphragm and thesecond to give an added flexibility to the carbon chamber. Thediaphragm spider is shown in section and appears as a truncatedcone. This cone shape makes it virtually self-centering. Arisingfrom each leg is a sheet spring finger which engages the second spider, also of sheet spring metal, is clamped to the rearelectrode in a manner such that the ends of the legs bear upon the The Design of Motor Starting Rheostats. Bv Arthur H. Ford, THE writer has frequently had trouble with motor-starters dueto the rush of current, when the final resistance was cut out,being so great as to throw the circuit-breaker or blow the fuseused to protect the motor. An investigation has shown that thisis a defect of nearly all motor-starters. Under the usual conditions,when the motor is started light, this is not noticed; but if the motoris required to start a load requiring
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
