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

Do not rub up the growth on the side of the watch-glass.

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

Suppose this to be a small button of gold on a shallow, flat watch-glass, on the stage of the microscope.

From A Text-book of Assaying: For the Use of Those Connected with Mines. by Beringer, Cornelius

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 Garnett, William

Then he takes a drop of the liquid and places it in the useful watch-glass.

From The Harmsworth Magazine, v. 1, 1898-1899, No. 2 by Various

I had left it in the watch-glass, exposed to solar heat.

From Curiosities of Medical Experience by Millingen, J. G. (John Gideon)