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Of some Phænomena of Glass drops

Of some Phænomena of Glass drops.png Of the Colours observable in Muscovy Glass, and other thin BodiesThumbnailsManometer for measuring Blood-PressureOf the Colours observable in Muscovy Glass, and other thin BodiesThumbnailsManometer for measuring Blood-PressureOf the Colours observable in Muscovy Glass, and other thin BodiesThumbnailsManometer for measuring Blood-Pressure

These Glass Drops are small parcels of coarse green Glass taken out of the Pots that contain the Metal (as they call it) in fusion, upon the end of an Iron Pipe; and being exceeding hot, and thereby of a kind of sluggish fluid Confidence, are suffered to drop from thence into a Bucket of cold Water, and in it to lye till they be grown sensibly cold.

Some of these I broke in the open air, by snapping off a little of the small stem with my fingers, others by crushing it with a small pair of Plyers; which I had no sooner done, then the whole bulk of the drop flew violently, with a very brisk noise, into multitudes of small pieces, some of which were as small as dust, though in some there were remaining pieces pretty large, without any flaw at all, and others very much flaw'd, which by rubbing between ones fingers was easily reduced to dust; these dispersed every way so violently, that some of them pierced my skin. I could not find either with my naked Eye, or a Microscope, that any of the broken pieces were of a regular figure, nor any one like another, but for the most part those that flaw'd off in large pieces were prettily branched.

The ends of others of these drops I nipt off whilst all the bodies and ends of them lay buried under the water, which, like the former, flew all to pieces with as brisk a noise, and as strong a motion...

Author
Micrographia
by Robert Hooke
Published 1665
Available from gutenberg.org
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