Bull's-eye condenser

Condenser Con*dens"er, n. 1. One who, or that which, condenses. [1913 Webster]

2. (Physic) (a) An instrument for condensing air or other elastic fluids, consisting of a cylinder having a movable piston to force the air into a receiver, and a valve to prevent its escape. (b) An instrument for concentrating electricity by the effect of induction between conducting plates separated by a nonconducting plate. (c) A lens or mirror, usually of short focal distance, used to concentrate light upon an object. [1913 Webster]

3. (Chem.) An apparatus for receiving and condensing the volatile products of distillation to a liquid or solid form, by cooling. [1913 Webster]

4. (Steam Engine) An apparatus, separate from the cylinder, in which the exhaust steam is condensed by the action of cold water or air. See Illust. of {Steam engine}. [1913 Webster]

{Achromatic condenser} (Optics), an achromatic lens used as a condenser.

{Bull's-eye condenser}, or {Bull's-eye} (Optics), a lens of short focal distance used for concentrating rays of light.

{Injection condenser}, a vessel in which steam is condensed by the direct contact of water.

{Surface condenser}, an apparatus for condensing steam, especially the exhaust of a steam engine, by bringing it into contact with metallic surface cooled by water or air. [1913 Webster]