object glass

American  

noun

Optics.

1. objective.

---

object glass British  

noun

1. optics another name for objective

---

Etymology

Origin of object glass

First recorded in 1655–65

Example Sentences

See Examples For:

object glass

Pulkova Observatory, object glass made by Alvan Clark & Sons, 144,   145; foundation and situation, 309-313.

From The Reminiscences of an Astronomer by Newcomb, Simon

The length of this shadow is easily found by means of a telescope, whose object glass is provided with a micrometer.

From All Around the Moon by Roth, Edward

Suppose we turn it in such a way that the eyepiece moves slightly outside the focus, or away from the object glass.

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 Serviss, Garrett Putman

This is conveniently done by cutting a large hole, the size of the brass cell of the object glass, through a sheet of corrugated strawboard, and slipping this on over the cell.

From Astronomy: The Science of the Heavenly Bodies by Todd, David Peck

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