encased and routed in the manner best suited to protect them from injury due to damage to the ship and shall be properly protected with fuses. All conductors shall be kept clear of electrical grounds. In the event that, due to the ship's structure, a long indirect routing is necessary, an alternate circuit shall be provided over another route. In all cases, the Rules and Regulations of the Bureau of Marine Inspection and Navigation of the Department of Commerce relating to the installation of these circuits shall be complied with.

(m) The cooling system of all auxiliary engine units Protection of driving the emergency power supply shall be adequately protected or treated to prevent freezing or overheating consistent with the season and route to be traveled by the vessel.

15. AUTO ALARM 10

(a) An "auto alarm" is defined by paragraphs 4 (m), Approved types. (1) and (2) hereof. "Radiomarine Corporation of America model AR-8600 auto alarm" and "Mackay Radio & Telegraph Co. auto alarm, type 101-A, manufactured by Federal Telegraph Co." are the only auto alarms approved by the Commission in accordance with Telegraph Order No. 28 for installation aboard United States cargo vessels in compliance with law.

(b) On ships aboard which an automatic alarm receiver is installed in accordance with the provisions of these rules, a means of giving an audible warning in the radiotelegraph operating room, in the radio operator's cabin, and on the navigating bridge shall be provided, which shall operate continuously after the receipt of an alarm signal or a failure of the auto-alarm system until stopped. Only one switch for stopping the warning shall be provided and this shall be located in the radiotelegraph operating room. In addition, a failure of the alarm to function normally resulting from prolonged static or any type of prolonged electrical input, or both, shall operate a visual indicator on the bridge. The type and method of installation of such visual indicator will be within the jurisdiction of the Bureau of Marine Inspection and Navigation of the Department of Commerce. (c) Each auto alarm of the type designated above, when first installed aboard a vessel of the United States, must bear an identifying serial number. Two or more principal components of one complete installation shall bear the same number. After the initial installation, if any principal component is entirely replaced, the substitute unit shall bear the serial number of the initial unit but must be identified in addition as a replacement. For this purpose the principal components are designated as follows:

Radiomarine Corporation of America model AR-8600 auto alarm.-One combined receiver and selector unit,

10 See Telegraph Order No. 28 of Mar. 10, 1937.

Audible warning

and switch for

stopping."

Type visual indijurisdiction

cator on bridge,

BMIN.

ponents and identifying serial

Principal com

numbers.

Report of instal

lation F. C. C. form 815.

Tubes and

batteries to be dated.

Instructions to be supplied with

without regard to container; one control and terminal box.

Mackay Radio & Telegraph Co. auto alarm, type 101-A, manufactured by Federal Telegraph Co.-One selector unit without regard to container; one receiver unit, without regard to container.

(d) The Commission shall be informed in writing on the prescribed form immediately upon completion of each auto-alarm installation aboard any vessel of the United States. Each report shall specify the type and serial number of the alarm, the name of the vessel, the date of completion of installation, the call letters and name of licensee of the ship radio station and the name of the owner and operating company of the vessel.

(e) Upon completion of each auto-alarm installation the electron tubes and dry batteries shall be dated to coincide with the date of completion of the installation. Only new electron tubes and new dry batteries shall be installed. The Commission may require the replacement of these electron tubes and dry batteries with new tubes and new batteries if and when such replacement is deemed necessary.

(f) Each installation of an auto alarm shall include at each installation. least two sets of written instructions for the guidance of the ship station radio operator and ship's officers relative to the auto alarm, which shall include(1) A general technical description of the auto alarm, including a circuit diagram of the auto-alarm receiver and a wiring diagram of its complete installation on shipboard. (2) A general explanation of its principles of operation.

Adjustment of test signal.

(3) A list of faults which may be indicated by the sounding of the audible alarm.

(4) Explanation of how to correct faults, remove and replace defective parts ard perform limited repairs at sea.

(5) Explanation of how to test the alarm and adjust the sensitivity control to the "optimum" setting.

(6) Explanation of the effect of various sensitivity control settings upon the operation of the alarm.

(7) Description of procedure to be followed with respect to operator making adjustments when alarm bell sounds and also in making log entries.

In addition, the instructions stipulated under items 5 and 6 above shall be summarized upon a card and permanently attached to the front of the alarm in a conspicuous position.

(g) The testing device of each individual auto alarm shall be permanently adjusted upon installation to produce a test signal of the correct value. This adjustment

shall be considered satisfactory when it becomes necessary to turn the sensitivity control from its position of lowest sensitivity (zero dial position) to its position of approximately one-third maximum sensitivity before the alarm can be actuated.

(h) While the ship is at sea the auto alarm shall be Tested daily. tested at least once every 24 hours by means of the testing device supplied as part of the alarm, the timing of the dashes to be made by reference to the second hand of the station's clock. A statement that the foregoing has been fulfilled must be inserted in the ship's official log and the radio log daily.

operation.

Entry,in ship when alarm

and radio log

(i) Adequate records shall be maintained according Reports of to the prescribed forms covering operation of the auto alarm. These forms shall be mailed to the Commission at Washington, D. C., on the 1st day of each month, covering the month preceding, beginning January 1, 1938. These reports are for the information of the Commission and the contents thereof will not be disclosed. (j) An entry shall be made in the ship's official log and the radio log when the warning light installed on the bridge (to indicate when the alarm becomes inoperative), remains lighted for a continuous period of 5 minutes. A statement shall be included giving particulars as to the time the operator was called to make the necessary repairs or adjustments; the reason for the failure; the names of any parts removed, added, or substituted; repairs effected; and the time the alarm was restored to proper operating condition.

(k) An entry shall be made in the radio log whenever the auto alarm becomes inoperative due to causes not indicated by the warning light, or whenever an autoalarm bell rings. The entry shall include a statement giving particulars as to the time the operator was called to make necessary repairs or adjustments; the reason for the bell ringing or failure to operate; the parts removed, added, or substituted; repairs effected; and the time the alarm was restored to proper operating condition.

16. COMMUNICATION BETWEEN RADIOTELEGRAPH STATION AND BRIDGE

becomes inoperative.

installation.

Where the radio room does not adjoin or open onto the navigating bridge structure of the ship, there shall be provided, between the bridge and the radio room, an efficient means of communication independent of any other communication system of the ship. Where the operating position of the emergency installation is not in Emergency the same compartment with the main radiotelegraph station, a similar means of communication also shall be provided between that position and the bridge of the ship. Determination of the necessity for these communication systems will be within the jurisdiction of the Commission. Determination of the type and location of these systems (except their point of termination in

Jurisdiction
BMIN.

Clock, for ships fitted with auto alarm.

Clock, for ships not fitted with auto alarm.

Location of.

Spare bulbs.

the radio room) and their ability to provide efficient communication shall be within the jurisdiction of the Bureau of Marine Inspection and Navigation of the Department of Commerce.

17. CLOCK

(a) Each ship fitted with an auto alarm shall be provided with a reliable clock with a sweep second hand, securely fastened in such a position that the second dial can be easily and accurately read by the operator from his normal receiving position, from the operating position at which he would transmit the auto-alarm signal, and from the operating position in the radio room used in testing the auto alarm for response to signals from the testing device. The clock shall have an hour dial not less than 5 inches in diameter, and it shall be capable of operation for at least 8 days on one winding; provided, however, that deviations from these specifications may be authroized by the Commission if such deviation does not adversely affect the reliability of the clock or the ability of the ship radio operator to transmit by hand the international auto-alarm signal when using the clock for timing these signals. A request for approval of any deviation from these specifications must be accompanied by a sample of the proposed clock face.

(b) Each ship station not fitted with an auto alarm shall be provided with a reliable clock with a second hand in conformity with the specifications of the preceding paragraph 17 (a); provided, however, that such ship station shall be exempt from the requirement of a sweep second hand until on and after January 1, 1939. A request for any other deviation from these specifications must be accompanied by a sample of the proposed clock face.

18. EMERGENCY LIGHTS

(a) There shall be provided in both the main radiotelegraph operating room and the main radiotelegraph transmitter room(s) emergency electric lighting operated from the ship's emergency power supply or the power supply of the emergency radio installation, independent of the ship's main electrical system, and so arranged as to provide satisfactory illumination to the operating controls, clock, and meters.

(b) In case the emergency transmitter or receiver is not located in any of the rooms associated with the main radio installation, a similar emergency lighting arrangement also shall be provided in the room or rooms containing such emergency apparatus.

(c) A spare electric-light bulb shall be provided in an accessible location in each room.

19. LIFEBOATS

The radiotelegraph installation on motor lifeboats designated by the Bureau of Marine Inspection and Navigation as requiring a radio installation shall be in efficient operating condition at all times while the ship is under way and shall comply with the following:

(a) Frequency of operation of transmitters-500 kilocycles.

(b) Type of emission of transmitter-A-2.

(c) Frequency tolerance of transmitter-0.5 percent. (d) Power of transmitter. Not less than 75 watts into the plate circuit of the stage supplying power to the

antenna.

(e) Antenna.-A single wire inverted L or T not less than 20 feet above the water line with a horizontal section of the maximum practicable length.

(f) Receiver. Electron tube type. Frequency range at least 350 to 550 kilocycles and capable of reception on types A-1, A-2, and B waves.

(g) Power supply. For transmitter, storage battery; for receiver, dry battery, or dynamotor operated from transmitter power supply. The power supply shall at all times be capable of operating the entire radio installation for a continuous period of at least 6 hours. If the power supply is also used to operate electrical equipment other than radio, its capacity must be sufficient so as not to affect adversely its ability to fulfill the foregoing requirement.

(h) Installation.-The component parts and assembly of entire installation shall primarily insure the utmost dependable operation, the design shall be such that heavy vibration and physical shocks to which a lifeboat is subject will cause no damage, and they shall be so housed and treated as to withstand saline dampness for extended period without damage and to minimize the adverse effect of prolonged exposure to salt water or salt spray. Storage batteries shall be mounted in cabinets which will provide protection from salt water spray and also allow proper ventilation. Provision shall be made to protect the operator from the elements when the lifeboat is afloat. ~ Provision shall also be made for the expeditious erection of the antenna system under adverse weather and sea condition. The use of metal masts and stays, unless broken by insulators, or of any structure of ground potential at the mastheads is not permitted.

(i) Inspection.-(1) The lifeboat radio installation shall be inspected and tested by a qualified representative of the licensee of the ship radio station within 24 hours prior to departure to sea from each port (except not necessarily more than once each week) and at least once each year with the lifeboat afloat in the water. The results of the inspection and tests shall be noted in the ship's radio-station log and the master informed.