"الملف 3/30 تجهيزات الزورق البخاري" [ظ‎‎٧] (٦١٤/١٨)

DYNAMOS.—These are of constant-voltage type and wound to suit the ordinary
acid battery of 12 volts. A cut-out and regulator is either embodied in the dynamo
or supplied as a separate unit.
DYNAMO CHAIR.—This provides endwise adjustment of the dynamo for the
alignment of the belt and facilitates the removal of the dynamo.
BATTERY.— This is of the 12-volt acid type. When delivered within the United
Kingdom it is filled with acid, charged and sent in a special container, free il
returned carriage paid. Batteries for export contain no acid. The capacity
of the battery must not exceed the maximum stated on page 1091, or the
dynamo will be overloaded. It is possible, however, to increase the
battery capacity without increasing the dynamo by fitting two batteries and
charging them one at a time. 0k
SWITCHBOARD.- Of teak, designed to suit the requirements of the dynamo and
to withstand marine conditions. All the connections are made by means of
screw terminals on the face of the switchboard. The following are mounted
on it: — ammeter, volt meter with switch, main switch and fuse for
charging circuit, main switch for lighting circuits ; 3 pairs of lighting
terminals each with fuse ; ivorine labels to indicate the connections ; spare fuse
wire.
SCREENBOARD, page 1088.—A self-contained unit. Of pine, brass screwed.
Sides are painted red and green, otherwise varnished. The side lamps are of
copper with dioptric glasses, making it possible to use very small bulbs. Oil
burners are supplied in reserve.
LIGHTS.—Types A, B, and C are weatherproof. A is used for the navigating
lights, B for deck illumination, C and D below deck.
BULBS.^—These should be of the following capacity:—Compass 3 watts, side
lights 6 watts, elsewhere 12 watts.
DECK LEAD.—The cable from the masthead light passes through this to a
switch fixed below deck. This avoids connections exposed to the weather, and
permits the removal of the screenboard without breaking any electrical^®
connections—see page 1090.
JUNCTION BOX.—The practice of joining one wire to another is unsatisfactory.
Every wire should terminate in a screw fitting of some sort. The use of junction
boxes is recommended.
FUSES.—One of the fuses on the switchboard should be reserved for the navi
gating lights, another for the lights above deck, and the third for those below deck.
WIRING.—For flexible connections use twin rubber-covered cable. For fixed
connections use single lead-covered cable. In existing boats the fore and aft
cable may be run along the gunwale. In new boats it is best to sink a brass
pipe }- 20 gauge into the deck beams before the deck is laid, as shewn page 1088.
This makes a neat job, saves time and facilitates repairs,