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Single melting by using the rotating gas furnace which will secure any

required degree of agitation of the liquid mass.

2. While the attempt to make large solid lenses may be successful,

still to make the effort to secure better results by adopting the new

methods of construction herein described.

That the difficulties connected with the undertaking are formidable

cannot be denied, but that they are insurmountable, who will venture

to assert, after recalling to mind the physical and mechanical triumphs

of the last half century? If success shall crown earnest and well-

directed effort, it will be worth to the world all possible cost.