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provide for e spark frequency hearing a treut relationship to
the reriodicity of the Alternator and suitable moans to be furnished for obtaining the necessary phase relationship with the A.C.Supply to ensure the production of a high frequency spark of ausical qual-
ity and even tone.
The Disc to be suitably at and ja by a metal cover acreand to the body of the machine, this cover arrrying the insulated station-
Provision to be made for efficient- ary adjustable cide eleotrojas.
ly ventilating the Disc Chamber.
PRIMARY HIGH FREQUENCY INDUCH NCE.
To be of the parallel bur slider type d'aigned to afford the ngocaudzy final adjustment for wave length in conjunction with the arrangement of the Condenser Bank and the inductance of the Connec- tore and other rarte of the High Trequency Primary Circuit.
TRANSMITTING JIGGER.
To be of the independent Primary and Seondary Circuit Type with a one turn fized Primary of Multiple Insulated Stranded Con- ductor and a seven turn Adjustable Secondary of similar cable suitably spaced. The Primary and Recondary to be made up in inde- pendert Teak Caees, the Secondary being arranged to move laterally with respect to the Frimary to provide for the variation in coupling
between the circuita.
ASRIAL TUNING
INDUCTANCE.
To consist of a solenoid winding of stranded conductor similar to that of the Jigger Secondary but of much greater length contained
in a light tenk cage fitted with highly insulated plug socket tap- pings providing for a wide range of adjustment.
MANIPULATING GEAR.
To consist of a Morse Key actuating a eingle electro magnetic minimum current relay key. The Morse Ker to be provided with tele-
phone short circuiting contacts to prevent the Operator's ear being rendered ingensitive by noise in the telephones during transmision.
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