S.L. 399.34 Art. 4an auto-alarm receiver each call to free from and the ending 1 second from 2), always more than 4½ fifth nor more area where and the receiver, must than twice a indicated of the receiver (ii) A an (iv) charge open after on Volts circuit S.G After charge 17 18 Note: This Volts of

Before approval as a standard type for installation in ships must comply with the following tests -

(i) The selector must in conjunction with the radiocommunications respond to 100 consecutive test-calls, produced locally; consist of three consecutive dashes under conditions interference. For the purposes of this test the timing of the beginning of each of the test dashes shall not differ by more than the correct timing of the alarm signal of 12 dashes (Rule provided that the dashes are not to be of less than 3½ nor seconds’ duration, and the spaces of not less than one than 1½ seconds’ duration.

(ii) The auto-alarm shall be installed for 14 days in an interference conditions are severe on the 600 metres wavelength selector, in conjunction with the radiocommunications not respond in such a manner as to operate the alarm more week to signals other than the alarm signal or the test signals in (i) above. During this period tests of the sensitivity shall be made in accordance with paragraph (a) of rule 3. farther test of 28 days’ duration shall be imposed with the object of ascertaining the reliability of the auto-alarm under interference conditions. For this purpose the auto-alarm shall be joined normally to external aerial, and the energy necessary for operating the auto-alarm shall be produced locally by a buzzer or other suitable appliance coupled to the aerial system; the energy given to the aerial by this means shall be of not less amount than that furnished for the tests indicated under paragraph (a) of rule 3. Each test call shall consist of the alarm signal. During this period of 28 days a minimum of 500 such test calls shall be made, of which 90 per cent must actuate the alarm and the alarm must not be actuated more than twice a week by other signals. Adjustments of the apparatus shall not be made more often than once every 12 hours. During every third day of the test laid down in sub-paragraph (iii) above, the selector and the radiocommunications receiver will be subjected to varying temperature conditions; for this purpose the selector and radiocommunications receiver will be enclosed in a chamber the interior of which will be raised in one hour to a temperature of 45º C (113º Fah.), maintained at that temperature for two hours and then allowed to cool naturally. SCHEDULE III

Ship battery log Daily record

Name of Ship ......................................... Type of Battery .............................. Date supplied ......................

Date discharge and discharge energy commencement discharge circuit when circuit commencement on of on of of charge

Times of Times Volts working Volts Rate Volts ending of open open after ending and

Monthly examination Volts of whole battery on open circuit ......................................... Volts of whole battery on minimum artificial discharge ...............

Volts of whole battery on maximum artificial discharge .............. Volts of whole battery when working emergency gear .................

S.G. of each Cell as measured Temp. of Acid Corrected 1 Before After charge Before After charge Before charge charge charge 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

table is not required in the case of alkaline electrolyte cells. whole battery on open circuit after discharge ........................