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This illustration displays a way in which to correct cataracts through operation.

Cataract Operation

This illustration displays a way in which to correct cataracts through operation.

"The operation of the condenser is the reverse of that of the air pump, and is a much more simple machine. The air pump, will deprive a vessel of its ordinary quantity of air. The condenser, on the contrary, will double or treble the ordinary quantity of air in a close vessel according to the force employed. This instrument consists of a pump barrel and piston, a, a stop-cock b, and the vessel c furnished with a valve opening downwards. The orifice d is to admit the air, when the piston is drawn up to the top of the barrel." —Comstock, 1850

Condenser

"The operation of the condenser is the reverse of that of the air pump, and is a much more simple machine.…