Sentence:  The wheel Q is also provided with frequently-recurring contacts T, which are different for each transmitting-device or “<WSD>aerophore</WSD>,” in order to indicate the location of the <WSD>aerophore</WSD> from which the direction signals are transmitted. 
Meaning of the word marked with <WSD> tags:  A predecessor of the radio, invented by Rene Homer in the early 1900s for communication between ships.