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

See Examples For:

object glass

Professor Lowell's telescope is over 32 feet in focal length, and has an object glass of excellent quality 24 inches in diameter, the work of the celebrated Alvan Clark.

From To Mars via The Moon An Astronomical Story by Mark Wicks

The larger the object glass and the higher the power, the greater are the atmospheric difficulties.

From Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers by Garrett Putman Serviss

Thoma's Haemacytometer consists of an object glass with carefully constructed cell, a ground absolutely plane coverglass and two pipettes for mixing the blood and saline solution used in the examinations.

From Microscopes and Accessory Apparatus Catalogue No. 40 by Ernst Leitz

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

From The Rival Crusoes by William Henry Giles Kingston

Of most interest to us in the present connection is the history of the 30-inch telescope of the Pulkova Observatory, the object glass of which was made by Alvan Clark & Sons.

From The Reminiscences of an Astronomer by Simon Newcomb