Investigations in Phonograph Phenomena

1903 Scientific American  
Lodge. In these figures the left-hand diagram shows the sending station, and the right-hand diagram the receiving station. At the sending station the aerial, t, is connected to a condenser, 1. 'fhe opposite terminal of this condenser is connected to earth through the condenser, n, and also to the spark-gap, g, through the adjustable inductance, ?n p. The electric energy is ae rived from the coil, c, which has a trembling break, and this coil can be put in and out Of circuit by the key, a. This
more » ... y the key, a. This key short-circuits the condenser, d, and the inductance, e. On the other diagram the aerial ends in a condenser, 1, and the oscillations set up in the aerial by the Hertzian waves excite other oscilla tions in the circuit of the condenser. This condenser, 1, has an overflow path in which the coherer, h, is in serted for the purpose of detecting the overflow with the battery, j, the telegraphic receiver, i, and a sub sidiary condenser, o. The object of the subsidiary con denser, 0, is to act as a shunt to the battery and re ceiver as far as sudden el. ectric changes are concerned, and this affords an easy path for overflow from the main condenser, 1. In order to provide for efficient tuning or syntonism between the sending and receiv ing circuits, the length, or self-induction, of each con denser circuit is capable of adjustment by a sliding contact, as at p?n. different from that of b. The instant the lips are opened, as in p, there is a sudden pressure on the ear, not a series of vibrations, and this is followed first by modified waves (representing pressures) and then by the special vibrations or pressures of the vowel. With
doi:10.1038/scientificamerican07181903-23035asupp fatcat:wkrv76bdxbgflgriintzsv6tay