watch-glass

British  

noun

1. a curved glass disc that covers the dial of a watch

2. a similarly shaped piece of glass used in laboratories for evaporating small samples of a solution, etc

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Example Sentences

See Examples For:

watch-glass

Wilcox is particularly strong on the manner in which the lad contrived to kindle a fire by using his watch-glass filled with water as a burning-glass.

From With Cochrane the Dauntless by G. A. (George Alfred) Henty

When a piece of plate-glass is pressed against a slightly convex lens, or a watch-glass, a series of coloured rings is formed by reflected light, with a black spot in the centre.

From Heroes of Science: Physicists by William Garnett

The gun-cotton is then removed from the filter and transferred to a watch-glass, and dried in the water oven at 100° C. When dry it is exposed to the air for two hours and weighed.

From Nitro-Explosives: A Practical Treatise by P. Gerald (Percy Gerald) Sanford

Here, let's get to-day's Mail and read it through the watch-glass and see if there's any difference?'

From Punch, or the London Charivari, Vol. 146, February 18, 1914 by Sir Owen Seaman

If the drop is large, place it face upward on the rubber mat, cover it with an inverted watch-glass, and allow it to dry.

From The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged. by J. W. H. (John William Henry) Eyre