A Printing Telegraph Concentrator

The central telegraph office of a city is the focal point for the collection and delivery of commercial telegrams within that city and the surrounding territory. This central office is connected telegraphically to the public branch offices within this area as well as to the offices of those patrons who have sufficient telegraph business to warrant the telegraph company incurring the expense of providing such a connection. Printers employing the start-stop method of synchronism have been found exceedingly adaptable for use in circuits providing such telegraph connections, and the telegraph companies are using these printers in increasing numbers for this purpose. The termination in a central office of a large number of these circuits, the majority of which is worked intermittently for the greater part of the time, requires the provision of some means of concentration in order that the traffic may be handled efficiently and economically. This paper describes a multipled turret printing telegraph concentrator designed and used by one of the telegraph companies to meet this need.