. The Family tutor . -^S^^— i^^ hy r;^to escape ^j^^^^^^ ^ Diving-bells are extensively resorted to Having disposed o^thr^.^V., we pass next to a consideration of the of ^^^^^^^ Expansibility. Elasticity. That subst^rSihe three fbrms ^^^^:::^^:::z::^. ll the process of coining, pieces of metal are ^f^elrl %eZ\osm^ or any steel dies, so that they become much denser ^h^n before.^y e g^^ ^^^ .^^ other liquid in a strong vessel, and causing a psto^^^^^^^^^ atmospheric air, it may be reduced to a less space, and g^^^\°^^ ^^^ad^^^^^^ compressed by the when enclosed in an India-ru
. The Family tutor . -^S^^— i^^ hy r;^to escape ^j^^^^^^ ^ Diving-bells are extensively resorted to Having disposed o^thr^.^V., we pass next to a consideration of the of ^^^^^^^ Expansibility. Elasticity. That subst^rSihe three fbrms ^^^^:::^^:::z::^. ll the process of coining, pieces of metal are ^f^elrl %eZ\osm^ or any steel dies, so that they become much denser ^h^n before.^y e g^^ ^^^ .^^ other liquid in a strong vessel, and causing a psto^^^^^^^^^ atmospheric air, it may be reduced to a less space, and g^^^\°^^ ^^^ad^^^^^^ compressed by the when enclosed in an India-rubber bag, or even a bladder, may i tnder the influence of heat all substances Th^ .n^; be J-edJor^-^^^^^solids as metals, by the apparatus represented in F^ It co .^ ^^ ^^ ^^«, b, on which are fastened two brass ^^P^^ ^^^/j^^thtl^^^ than the wholereceive the ends of a metalhc bar, e. Tbis^^barj^^ni y T^;:;;;;:^::;^;;;^ the Appenai. we gave an Illustration of the diving-bell previous to its Fiff. 6. NATURAL PHILOSOPHY. distance between the notches, so that when it is set in its place, it can be moved back-ward and forward, and emits a rattling sound. But if boil-||gl^ fill ^pl ing water be poured upon it, it expands and occupies the \\i^^^ dwl ^jjoie distance, and can no longer be moved. ^ ^ [A very simple manner of illustrating the expansion of Fig. 7. metals by heat is shown in the following diagram. A plate of brass or other metal is made of the same shape as the upper ^ . one in the above figure, and a rod of metal—the same kind as |)% 4\V|^;^^v^^^^the plate—is fixed to a metal stem inserted in a wooden handle, ^^] as d c. The rod is made to fit the hole b, and also the space a, -^^J^^^^saiCbetween the two ends. When the metallic rod is plunged intohot water, or heated over the flame of a spirit lamp, the expansionis so great, that it becomes impossible to pass the end of the rodthrough the hole b or the space a.—W. T. The expansion of
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Keywords: ., bookcentury1800, bookdecade1850, bookpublisherlondo, bookyear1851
