|TELEPHONE INSTRUMENT AND AUTOMATIC CALL BOX COMBINED No. 443
This instrument consists of a wall telephone fitted with hand micro-telephone No. 530 with cord No. 2061, four-magnet generator No. 479, and battery box to accommodate two cells No. 971, and also an automatic call box of the same construction as No. 442 with a separate cash box.
Its most prominent feature is that the Exchange cannot be called until a coin of the proper value has been put into the automatic call box. When the connection is completed and the operator asks the subscriber to pay, he presses the key marked 2 on the right-hand side of the call box and the coin drops into the cash box. The coin touches a vibrating spring, and indicates to the operator that the fee has been paid. If, on the other hand, the number required is engaged, the subscriber has to press key 1 on the left-hand side of the call box, when the coin will be restored to him.
The instrument is constructed in such a way as to prevent all possibility of frauds.
The cash box is placed at the bottom of the instrument, and is altogether separate from the other parts.
Weight 22.70 lbs.
Price £8 1 0s.
Taken from the Ericsson Telephone Catalogue 1903
Last revised: October 01, 2019