"Compact" Style Telephone
This instrument has been specially designed to embody all the latest features and improvements in as neat and compact a form as possible, and possesses many distinctive points which will doubtless commend themselves to the purchaser. For general appearance and equipment, kindly refer to Figs. 1 and 2. The Cabinet is strongly made of carefully selected, well-seasoned kiln dried oak in one uniform size only, and will accommodate any of the specified equipments mentioned hereafter. Four distance pieces are firmly secured to the corners at the rear of the Backboard, which prevents moisture affecting the Cabinet should the set happen to be mounted on a damp wall.
The front of the telephone is very substantially hinged and locked in position by a machine screw and bracket, while a suitable writing shelf is also provided for memoranda purposes. On opening the front, the whole of the working parts and wiring are exposed to view, and this ready accessibility for inspection or other purposes will make a strong appeal to the practical engineer. The wiring is of the simplest possible description, and all salient features will be easily followed and understood by a glance at Fig. 2, which shows the set with the front thrown back. The Apparatus employed is of our standard high-grade manufacture, and that attached to the front is wired to separate connection hinges which furnishes an excellent example of employing simple means to avoid any possibility of the set getting out of order. Line terminals of sound design and ample clamping surface are arranged on the top of the Cabinet, while binding posts are provided for connecting the necessary dry cells to the local transmitter circuit.
The Generator, which is the heaviest item of the equipment, is securely bolted by four machine screws to the shelf, which is strongly trenched into the sides of the Cabinet.
In concluding our brief description of the "Compact" Telephone, we would call attention to its special adapt-ability for shipment. Fig. 3 shows set ready for packing, and all parts which have been removed are stowed away in the lower portion of the Cabinet, where the cells will be located. This effects a great saving in space, and undoubtedly protects the apparatus from injury during transit. The dimensions of this Telephone are shown on Fig. 4.
We can supply this style of telephone with any of the equipments given in the table, wired to the circuits described below, and illustrated in figures 5 to 10.
Full particulars for ordering will be found in the schedule outlined in the table.
The first equipment is suitable for use on short bridging lines where a few stations only are required, and we do not advocate the use of more than 8 of these sets on any one line of average length.
The second equipment with 4-Magnet Generator will be found to meet all the requirements on a party line, where the number of telephones bridged does not exceed twelve, and where the line is of moderate length.
For all conditions above these where the most powerful Generator and sensitive ringer is required, we would recommend the 5-Bar Generator and 1600 ohm ringer; these will be found to give excellent service with any number of subscribers up to thirty - or even beyond that number - bridged on a long distance line, and we have no a hesitation in stating that this equipment is the most powerful that can be obtained. Efficient service will be given under the most severe conditions found in party-line working.
Bridging - Silent Ringing
Bridging - Sure Ring
The C 103 Condenser has been specially designed for use with this circuit, and is of 0.5 MF capacity, of small size and neat appearance. The wiring of all our " Compact " type Telephones is arranged for the addition of these Condensers, and they can be fitted at any future time with the greatest of ease (see Fig. 2), should it be found desirable, by cutting the wires which run to the bottom Hinge and connecting the Condenser in series therewith. The Condenser is fixed to the door by a special clip designed for the purpose, which can be supplied at a minimum outlay.
Our Nos. 405, 505 and 507 sets are equipped with this Condenser.
Bridging - Push Button
This is our standard bridging circuit, with the addition of a push button
key, and its operation is as follows:-
The talking circuit is full metallic, and the earth is only on when signalling the exchange.
Our No. 506 set is equipped with this circuit which is shown in Fig. 9, while all the "Compact" type sets are wired so that the key can be readily added at any time if desired.
Bridging - Push Button, Sure Ring
Cells are not included in any of the above equipments
Last revised: January 24, 2011