247
-tion. The Primary to be provided with Terminals of ample dimen- sions for connection to the Bus Bars of the Condenser Circuit, and the Sea ndaży to be fitted with suit-ble plug Sockets for connec- tion at various points to the Aerial Tuning Inductance. The Second- ary to be adjustable laterally with respect to the Primary for the purpose of varying the coupling between the circuits.
The Aerial Tuning Inductance to consist of a solenoid winding of cable similar to that of the Jigger Secondary having a total inductance sufficient for tuning the Aerial Circuit over the full
The Inductance range of transmitted wave lengths specified above. to be provided with insulated plug sockets to enable it to be connected to the Jigger Secondary and the Aerial respectively.
KANIPULATINO GEAR.
To consist of a Yarse Key actuating electrically a pair of double polo Magnetic Relay Keys in the high tension or secondary
The hand key to be provided with a circuit of the Transformer,
air of contacts adjusted to automatically short cirouit the tele- bone colle of the Receiver when the key is depressed, and in this anner to prevent the Operator's ear being rendered insensitive by disturbing noises in the telephone during tranamisaion.
(સફે
RECEIVING APPARATUS.
To comprise the following instruments:-
One Receiver consisting of a double Marconi Magnetic Detector working in conjunction with the Company's well known Multiple Tuner, the Combination being suitable for the zoception of all wave lengthe between the limits of 100 and 2,300 metres.
(b) One Receiver of the Marconi Vaive Tyre, having the Velve Detector itself and the arrangement of adjustable resonating cir-
This Receiver to be suitable cuits mounted in one Containing Caso.
for the reception of all wave lengths between the limite of 1700 and 4400 metres. A Battery Set with complete Charging Devices to be provided for use with this Instrument.
Both Receivere to be calibrated in such a fashion as to permit
-&-
No comments yet.
Private notes are available after approval.