170 MR. RICHARD ROBERTS ON PROPOSED 
working the engine, which, in addition to turning the 
fly-wheel, may be employed to pump water, hoist coals 
and stores aboard, sound bells, &c.; and T think that 
steam might be advantageously used to keep the light 
room sufficiently warm to prevent the adhesion of snow 
to the windows, to warm the barrack rooms, and to sound 
one or more whistles. 
mn (Fig. 1) is the casing surrounding the fly-wheel, 
and o a bridge piece bolted to it, concentric with which it 
carries a stud upon which is the plate that maintains in 
its. position the light apparatus, whose weight is borne 
by a number of rollers which are carried round with the 
fly-wheel. 
p is the flame of the lamp, whose pump is to be worked 
by the shaft K, g the glass chimney, g! a metal tube fixed 
to the frame which carries the lenses, and g? a telescopic 
metal tube, the lower end of which is carried by gimbols 
at the top of the frame carrying the lenses, and supported 
at its upper end by gimbols in the top of the dome: This 
tube works freely in the exit tube g3. I propose that this 
lighthouse be moored by three anchors, and that to each 
of these two heavy cables be attached, which shall pass 
through hawse pipes in the side of the float situate 120° 
from each other, as shown in the small drawing. I also 
propose to employ a suitable windlass, so adapted as to 
give the requisite tension to the six chains. By this mode 
of mooring, the vessel will be always kept over one parti- 
cular spot, and the cables will surge much less; there will 
consequently be less risk of the anchors dragging, whilst 
from whatever quarter the strain may come the resistance 
will be about the same. I may add that the central por- 
tion of the first deck is raised above the outer portion to 
prevent water flowing on to it. I also propose to have 
one or more life boats attached to these floats for the 
purpose of rescuing the crews of ships in distress, or for 
