To save the telephone companies money and to serve better those communities which have both the new dial and the old manual telephone service, Bell Telephone Laboratories invented a device which saves time and reduces errors on calls from dial to manual instruments. Last week the device was demonstrated in Manhattan.
The present system of putting through a dial telephone call is as follows: For each of the first three letters of the called exchange name, and for the four figures of the number and the letter of the party line, the...