Thomas Appleby

“ The resistance of the winding surrounding the armature is generally 1000 ohms and the resistance of the complete set 2000 ohms, there being only one coil in each receiver. The cord connections are inside of the receiver case in the center of the circular permanent magnet.
The exterior appearance of the Amplifying receivers is much the same as that of the ordinary type. The headband however, is of entirely new construction and has been found to be very easily adjusted, very comfortable, fits any head regardless of size, and does not pull the hair. ”

“ The theory or principle of operation of the new receiver appears to be generally unknown among the amateurs. Reference to Sketch 1 will assist in a better understanding of its operation. If we arrange a permanent magnet with double pole pieces NN and SS opposite the ends of an armature AB, rocking on pivot C, and wind a coil on he armature a slight current through this coil will magnetize the armature and one of its ends will become North and the other South polarity. ”

“ Whether used with an Audion, crystal or any other form of detector the results will always be far better than with ordinary receivers. Signals that cannot be heard with ordinary receivers can be read with the Amplifying receivers. ”