:w:Hiram Percy Maxim

“ It is the writer’s opinion that another type of generator such as you mention would not he as efficient as the Armstrong circuit. This is due to the peculiar repeating action which is obtained between the inductance coils.
“Increase in audibility” means that the instruments amplifies a given sound a certain number of times when a given factor of loudness is taken as the audibility unit. That is, a certain strength of signal may be taken with an audibility of one, then the amplification or increase in signal strength is a given number times the audibility. ”

“ In the various Armstrong circuits, the increase in strength of signals is due to amplifying effect as in the ordinary amplifier rather than the heterodyne principle. Of course, in the Armstrong circuit, these two effects are combined, but the real increase is due to amplification. ”

“ Many amateurs are unable to have current installed in their homes either because they live too far away from current wires or else they cannot afford the cost of installation. Cannot amateurs find some means by which long distance work with a spark coil may be improved? ”