The maximum candlepower which may be obtained in the
beams of three Admiralty Hand-lamps have been measured.
From this information it was possible to assess the
visibility which each hand-lamp would give in smoke. None
of the lamps was of such a design as to give the best type
of beam for use in smoke, and a 10-20 per cent increase in
visibility would have been obtained if a good focussing
device had been included in the lamps.