...folded without breaking. Tbi-. properly of zinc was fuel ascertain«! by Mr. Sa^-e. When heated to about 400°, it becomes so brittle, that it may be reduced to powder in a mortar. Its tenacity has not been ascertained. When heated to the temperature nf about 7004, it melts; and...

...is said) be passed through rollers. It may be very readily turned on the lathe. When heated to about 400°, it becomes so brittle that it may be reduced to powder in a mortar. 4. It possesses a certain degree of ductility, and may with care be drawn out into wire.* Its tenacity,...

...but when heated it emits an odour resembling that of garlic. It is the softest of all the metals; and so brittle that it may be reduced to powder in a mortar. When exposed to the air, it loses its lustre, turns black and falls to powder; but under water it remains...

...boiling point of water, it is very malleable, ' îrât heated to double that, or some-" what above 400, it becomes- so brittle that it may be reduced to powder in a mortar. At a still higher temperature, about 680, ' it melts, and may be evaporated and distilled in close...

...at common temperatures, and at a heat of about 300°, it may be easily reduced to thin plates, but, if heated to 400°, it becomes so brittle, that it may be reduced to powder. Its specific gravity varies from 6.861 to 7.190, the lightest being generally the purest; it is soluble...

...Wire ropes are now much employed in this country in mines and coal-pits ; and there is one of 63 miles in* length, in continual operation on the London and...malleable at a white heat, but are very little so \vhen cold. 69. The capability of receiving impressions from blows, which the malleable metals possess,...

...variety of forms on which their utility to man so much depends. The property of receiving a new tet by the blow of a hammer, or by impact, as it is properly...this is most the case with iron and platinum, which nre highly malleable at a white heat, but are very little so •when cold. 69. The capability of receiving...

...sustaining a weight of 26 pounds. Heated beyond that point, say between 400° and 500" Fahrenheit, it again becomes so brittle, that it may be reduced to powder in a mortar : it melts at 700°. The metal is obtained from two ores— namely, calamine, a native carbonate ;...

...(Bcrthier). Colour gray, somewhat whiter than cast iron ; texture finely granular, or prismatic ; hard, and so brittle, that it may be reduced to powder in a mortar; not attracted by the magnet, and not magnetic ; fuses at the highest lemperature of an assay furnace...

...is tough and malleable at ordinary temperatures; but at a temperature approaching its fusing-point it becomes so brittle that it may be reduced to powder. In reference to this property copper is said to be "hot short." The behavior of zinc in this respect is...