Telegraphs in the 80s

Too Long; Didn't Read

The usual type of wireless telegraph transmitter employs a disruptive discharge, or spark, as it is called, for setting up the oscillating currents in the aerial wire system and this is the type of apparatus described in this chapter. There are two ways to set up the sparks and these are: (1) with an induction coil, or spark-coil, as it is commonly called, and (2) with an alternating current transformer, or power transformer, as it is sometimes called. Where you have to generate the current with a battery you must use a spark coil, but if you have a 110-volt direct or alternating lighting current in your home you can use a transformer which will give you more power.