NAVIGATION LIGHTS

Port Side-Light.

257

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Starboard Side-Light.

which must in this case be a single one, should be set as in the masthead
b'ght and so screened that a line drawn from the centre of the wick
in a direction two points abaft the beam shall cut the edge of the housing
of the glass front of the lantern.
Electric Lights.
18. General.—Electric lanterns are not required to be of a type
approved by a certificate of approval and such certificates will not, in
general, be issued. Subject to this, and except where otherwise stated
or where the context implies otherwise, the instructions relating to
lanterns in which oil is burned apply equally to those in which electric
light is used. Separate lanterns must always be provided for electric
and oil lamps, and oil lanterns must in every case be carried. Lanterns
in which electric light is used should, as far as possible, be air-tight and
the lanterns should be made to open from the top in order to afford
facilities for cleaning and repair, and the checking of measurements.