CO129-547-1 Wireless telegraph and telephone services 16-1-1934 - 26-1-1934 — Page 25

G. F. 22

25

Inside Sheet

HONG KONG

INDENT No:-.

2

PAGE.:

Estimated Cost in England.

Item

Quantity.

Description of Articles.

Total.

No.

Rate.

£. S.

d.

2 (Contd.) controlling devices, indicating

3

1

1

instruments, busbars, feed

equalising resistances, overload and power relays and indicating lamps and detail parts as

required for the efficient half wave rectification of the H.T. alternating current from the Power Transformer.

MAIN SMOOTHING UNIT, consist- ing of :-

a.l Set Smoothing Chokes for

1-1/4 amps. D. C.

b.1 Smoothing Condenser for

7000 volts working pressure

c.Earthing Links & Resi stan ces.

d. H. T. Connectors & Insulators.

e.1 Set Link Switches.

SUBSIDIARY RECTIFIER RACK for Telegraph Transmitter, comprising:

a.Rectifier for Drive Anode

supply, consisting of three U. 14 valves, to deliver 300 m/a. at 250 volts D.C.

b.Rectifier for Amplifier and Drive grid negative, con- sisting of three U. 14 valves to deliver 180 m/a. at 300 volts D.C.

c.Rectifier for Absorber grid: potentials, consisting of three U.14 valves to

deliver 180 m/a. at 300

volts D. C.

The Subsidiary Rectifiers to take

their supply from the 350V. 50

cycle three phase supply.

Carried Forward......

Remarks or references to specifications or special notes (if any) on separate sheet.