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"Post Office Standard Station" means a wireless telegraphy station designated by the Postmaster-General as a standard station for marine wireless telegraphy range tests. "Normal range by test" means normal range proved by test with a Post Office Standard Station by means of a receiver employing a crystal rectifier without amplification devices. The number of metre amperes being determined by multiplying the actual height in metres of the aerial, at its highest point above the deepest load water line of the ship, by the current in amperes measured at the base of the aerial. "Normal range by reckoning" means normal range reckoned in relation to power in metre amperes in the case of type B or fully modulated type A2 transmitters on the assumption thatġ00 nautical miles corresponds to 60 metre amperesĨ0 nautical miles corresponds to 45 metre amperesĥ0 nautical miles corresponds to 25 metre amperes

"Normal range" means the distance in nautical miles from a ship to which wireless signals on a frequency of 500 kilocycles (wave length 600 metres) can be transmitted over sea by day under normal conditions so as to be clearly perceptible by means of a receiver employing a rectifier of the crystal type without amplification devices. "Cargo ship" means any ship not being a passenger ship. (2) In these Rules unless the context otherwise requires the following expressions have the meanings hereby respectively assigned to them:. In pursuance of the powers conferred upon them by the Merchant Shipping (Wireless Telegraphy) Act, 1919, and the Merchant Shipping (Safety and Load Line Conventions) Act, 1932, and of all other powers enabling them in that behalf, the Board of Trade in consultation with the Postmaster-General hereby make the following Rules:-ġ.-(1) These Rules may be cited as the Merchant Shipping (Wireless Telegraphy) Rules, 1938, and shall come into force on the first day of January, 1939. 38), AND THE MERCHANT SHIPPING (SAFETY AND LOAD LINE CONVENTIONS) ACT, 1932 (22 & 23 GEO. (8) Compulsory Wireless Installations THE MERCHANT SHIPPING (WIRELESS TELEGRAPHY) RULES, 1938, DATED DECEMBER 15, 1938, MADE BY THE BOARD OF TRADE UNDER THE MERCHANT SHIPPING (WIRELESS TELEGRAPHY) ACT, 1919 (9 & 10 GEO.