object glass

American  

noun

Optics.

1. objective.

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object glass British  

noun

1. optics another name for objective

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Etymology

Origin of object glass

First recorded in 1655–65

Example Sentences

He unscrewed the object glass from Voules’s telescope, but in vain tried to obtain a light.

From The Rival Crusoes by Kingston, William Henry Giles

Such an instrument is known as a compound or astronomical telescope, and the first lens is called the object glass and the second lens the magnifying glass, or eye-piece.

From Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 by Martin, Marcus J.

In answering him I called his attention to the ability of Alvan Clark & Sons to make at least the object glass, the most delicate and difficult part of the instrument.

From The Reminiscences of an Astronomer by Newcomb, Simon

Small portion of the outer integument of the complemental male, as seen with a 1/8th of an inch object glass.

From A Monograph on the Sub-class Cirripedia With Figures of all the Species. by Darwin, Charles

It was speedily determined that the object glass should be shaped by the Clarks, who should also be responsible for getting the rough disks.

From The Reminiscences of an Astronomer by Newcomb, Simon