The diameter lens, weighing, contains 760 pieces of highly polished prismatic glass, floating in a 7 cwt bath of mercury, and rotating also during the day to reduce the risk of fire from the sun's rays.
The diameter lens contains 760 pieces of highly polished prismatic glass. The diameter lens is weighing. The diameter lens was floating in a 7 cwt bath of mercury. The diameter lens was weighing. The diameter lens was rotating also during the day to reduce the risk of fire from the sun's rays. The diameter lens was weighing.