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To Wash Silks (No person ually and keep it)

No person ually, and keep it for mounting. Others are to be made in the same manner; and if the operation be carefully conducted but very few will be imperfect. The smaller the drop melted, the higher in general will be its magnifying power. It may be mounted by placshould ever wring or crush a piece of silk ing it between two pieces of brass which when it is wet, because the creases thus made will remain forever if the silk is thick and hard. The way to wash silk is to spread it smoothly upon a clean board, rub white soap upon it, and brush it with a clean hard brush.

The silk must be rubbed until all the grease is extracted, then the soap should be brushed off with clean cold water, applied to both have corresponding circular holes cut in them, of such size as to hold the edge of the lens.

They are then to be cemented together. A perfectly round glass globe filled with pure water also makes a powerful lens.