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

Projecting, or bulging out, as the exterior surface of a watch-glass, which may represent the form of a convex mirror, or lens.

From Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained by Thomas P. Jones

In shape, the cornea is circular and prominent, resembling a miniature watch-glass, about 1/25 of an inch thick.

From A Treatise on Physiology and Hygiene For Educational Institutions and General Readers by Joseph Chrisman Hutchison

To preserve Hydra in an expanded condition.—Place the polyp in a watch-glass of clean water and wait until its tentacles are expanded.

From Freshwater Sponges, Hydroids & Polyzoa by Nelson Annandale

Indeed, the dust here is almost worse than in Pekin, where the natives say that it will work its way through a watch-glass, no exaggeration, as I can, from personal experience, testify.

From From Paris to New York by Land by Harry De Windt

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 Cornelius Beringer