OCR Text |
Show WIRE LE S3 TELEPHONY. A new system of wireless telephony is being experimented with by G. J. de Guillen Garcia, a Spanish engineer, and his son. It was the son who noticed that in the telephone of the Tbmmaai coherer located at the receiving stations, sta-tions, there was a sound difference, according ac-cording to the air gap in the Interrupter, Interrup-ter, of the Rhumkorff apparatus. This suggested the Idea that a similar apparatus appa-ratus would be susceptible of transmitting transmit-ting the human voice to a distance without with-out the agency of the wire. The arrangement ar-rangement used in tho subsequent experiments ex-periments is simple. At the transmitting transmit-ting stations is a Rhumkorff eoli giving a spark 12-18 inches in length, as well as the necessary oscillation, a small atenna, and a grounded conductor. Between Be-tween the induction coil and a small battery of Orenet cells Is a special microphone, mi-crophone, acting both as transmitter and interrupter. The automatic interrupter inter-rupter of the inducting coll is stopped and the condenser is used for enhancing the oscillator spark. At the receiving station is a Tommasl coherer connected con-nected to the receiving atennaa and the grounded conductor In a telephone receiver the noise produced by the Hertxlan waves on traversing the coherer co-herer is plainly heard. On applying the mouth to the microphone and singing or speaking every sound vibration was attended by an interruption in the passage pas-sage of the electric current through the primary circuit of ths induction coll, the number of sparks at the oscillator thus being varied. The underlying principle shows, therefore, some analogy with ths mechanism of an ordinary telephone. tele-phone. The week point appears to be the difficulty of getting a microphone of sufficient vigor. While with Garcia's condenser ths present apparatus transmits trans-mits singing tones with satisfaction. It leaves much to be desired in Its transmission trans-mission of ordinary speech. ' |