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

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

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

Yes, over that circular field, fifty miles across, the firmament closed all around at the horizon, as a watch-glass closes round the dial-plate of the watch.

From My Schools and Schoolmasters or The Story of my Education. by Miller, Hugh

The precipitate, having been dried, is transferred to a watch-glass.

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

This is the cornea, a hard, perfectly transparent membrane, looking much like a curved watch-glass.

From Through Magic Glasses and Other Lectures A Sequel to The Fairyland of Science by Buckley, Arabella B.

A watch-glass is warmed, and a layer of wax is melted over the convex side.

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