Ill 
of the float, or this wheel might be caused to revolve at its 
proper speed by two relays, each of three men. The engines 
and steam might be used for a variety of purposes, as to sound 
bells or whistles, hoist coals aboard, prevent the adhesion of 
snow to the lantern, &c. 
Mr. Roberts proposed to moor the float by three anchors, 
to each of which he would attach two heavy cables, passing 
through hawse pipes 120° from each other; the tension on 
these he would regulate by a suitable windlass, and he fully 
believed that by this system of mooring the float (which 
together with the tower he would construct of iron), and by 
causing the dioptric apparatus to rotate (about one hundred 
times per minute), the desired object would be attained. 
