75. Staff were made available to the Director of Marine for in- specting and surveying ship radio stations to ensure compliance with the International Convention for the Safety of Life at Sea and to advise on the installation of equipment on new vessels. A total of 189 ship radio stations were surveyed for the issue of Safety Certificates and 75 vessels were inspected.
Radio Monitoring and Interference Control
76. Interference from plastic welding machines continued to be the major source of interference but has decreased in intensity. Investi- gations into complaints arising from interference of this nature necessitated 237 visits to industrial premises where 70 unlicensed machines were found in 23 factories. Three faulty machines were sealed in order to prevent disruption of essential communications.
77. Fourteen evaluation tests on VHF transceiver equipment were carried out.
78. The operating parameters of civil aviation beacons and ground/ air systems were checked at regular intervals. The frequencies of 1,444 mobile radio system transmitters were measured to ensure that they were operating within prescribed tolerances. The transmitters of 147 ships undergoing radio survey were also checked.
79. Supervisory monitoring of local radio communications was continued and proposed new channels were examined prior to allocation.
Government Telephone Services
80. The Department plans and makes arrangements for the provi- sion of telephone services for all Government Departments. The number of government telephone facilities in operation at 31st March, 1973, is listed below:
Direct Exchange Lines and Junctions
Official Residential Telephones ...
Extensions
Private Wires, Tie Lines and Long Line extensions
Switchboard Extensions
Intercom. Units
Total
***
:
5,173
1,262
2,260
426
7,052
1,413
17,586
14
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