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The Pamphlet Collection of Sir Robert Stout: Volume 73

For Determining Constancy of Volume

For Determining Constancy of Volume.

Neat cement is mixed to a stiff paste and formed into pats [unclear: upon] glass or metal plates. One pat is kept in air, and another, [unclear: when] thoroughly set, is immersed in water. If after a day or two the [unclear: pats] remain intact and free from cracks at the edges, a sound [unclear: cement] is assured. Should the pats show crumpling or clicking the cement is dangerous—without it can be proved that the defect is due to [unclear: freshness] of grinding, which is easily remedied by air-slaking.

Some Engineers use thin glass test-tubes filled with [unclear: gauged] cement, but as nearly all good cements expand slightly the [unclear: mere] cracking of the tube would scarcely warrant condemning the [unclear: cement] A "blowey" cement would completely shatter the tube.