iolet rays which have the greatest chemical effect upon a photographic
film. Carbon filament lamps are very poor in this respect.

[7] A description of the apparatus required will be found in Ganot's
_Physics_.

[8] Great care must be exercised in using this solution, as it is
exceedingly poisonous.

[9] Two clocks would isochronise if their hands travelled at precisely the
same rate round the dials, but would not synchronise unless they both
registered the same time as well.

[10] Line screens can be obtained from Messrs. Penrose, 109 Farringdon
Street, London; or Messrs. Fallowfield, 146 Charing Cross Road, London.

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