t at the Royal Standard Foun- 1000 feet ahead, on a dark night, and is far perfectly under the control of the operator, addressed as above. dry, since the opening ofthat immense estab- superior to the English lamp. On the whole lishment, have been condemned as unfit for ser- = —= Mr Colhnyn makes… … November 17th, 1857. The instrument of which a perspective view may be regulated by the graduations on the wascast by Aller & Co. The test was to as- A piece of metal, A, of the shape shown, is given in Fig. 1 is designed to serve for beam. Now, if the velocity be equal, or c be certain the…
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