This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 Excerpt: ...Vessels made of thin glass are less liable to break from the cause we have been considering than those of a thicker substance--cold water may be foured into a Florence flask, and the flask held over the flame of the spirit amn till the water boils, without any danger of fracture; for the glass is sufficiently thin to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 Excerpt: ...Vessels made of thin glass are less liable to break from the cause we have been considering than those of a thicker substance--cold water may be foured into a Florence flask, and the flask held over the flame of the spirit amn till the water boils, without any danger of fracture; for the glass is sufficiently thin to allow the heat to penetrate quickly, and the opposite surfaces to expand together. The same experiment attempted with a bottle of thicker glass would be followed by a crash on the first application of the flame. It is a mistake, then, to suppose that, although a thin tumbler may be broken by pouring hot water into it, another thick, strong glass vessel would escape a similar catastrophe; for the thicker the glass, the more liable it is to crack from the sudden application of heat. The expansion of fluids by heat is well exemplified in the thermometer, the construction and principle of which, it may be interesting to explain. The first thing is to procure a tube of glass, with a narrow and regular bore throughout. This is done by suddenly extending a hollow glass globe, while it is in a state of fusion. To ascertain the evenness and regularity of the calibre or bore, a small portion of mercury is introduced, and the length it occupies within the tube accurately measured. The mercury is then pushed on, and measured again. If the bore be of the same dimensions throughout, the mercury will always measure the same in length; if the bore be wider at one part than another, the mercury will, of course, take up a shorter space in the wider portion of the tube, and vice versa. A small proportion only of the tubes made, possess the requisite evenness of bore; only a few, therefore, are set aside for thermometers. Having selected a suitable tube, the manuf...
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Add this copy of The Morning Call, by Mrs. Ellis to cart. $44.16, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2018 by HardPress Ltd.
Add this copy of The Morning Call, By Mrs. Ellis... to cart. $66.43, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
