J. H. Bunnell & Co. Description (Brief) Telegraph keys are electrical on-off switches used to send messages in Morse code. The message travels as a series of electrical pulses through a wire. The ...

Object Details maker J. H. Bunnell & Co. Description (Brief) This telegraph register made by J. H. Bunnell and Company was used on a fire alarm system. When a person activated a call box to report a ...