Police teletypewriter communication

PoLICE organizations throughout the country are rapidly adopting the latest development in record communication, namely, the teletypewriter. By this means alarms are typed at one point and simultaneously recorded in printed form at a large number of widely separated stations. The engineering for a modern police system involves not only the provision of the teletypewriter machine, but large networks of telegraph circuits with the associated switchboards, telegraph repeaters, power plants, and testing equipment which also must be designed, manufactured, and installed.