. Blakelee's industrial cyclopedia, a simple practical guide ... A ready reference and reservoir of useful information. More than two hundred illustrations. certain is it to begood ; but that rule is not in all cases to be relied upon. There are better in-dications : Good lime is greasy or salvey to the touch, while poor lime is grittyand dry. When good lime slakes in water it falls quickly, causes the water toboil up furiously, and gives out a great quantity of heat. The slaking of poorlime is attended with but a slight boiling of the water, and a small increase ofthe heat; moreover, the quan
. Blakelee's industrial cyclopedia, a simple practical guide ... A ready reference and reservoir of useful information. More than two hundred illustrations. certain is it to begood ; but that rule is not in all cases to be relied upon. There are better in-dications : Good lime is greasy or salvey to the touch, while poor lime is grittyand dry. When good lime slakes in water it falls quickly, causes the water toboil up furiously, and gives out a great quantity of heat. The slaking of poorlime is attended with but a slight boiling of the water, and a small increase ofthe heat; moreover, the quantity of water required to slake good lime will benearly one half its bulk. Good lime, when slaked, will swell to twice its original bulk, and if exposedto water continually changed, the lime will all be taken up without leaving anyresidue. Poor lime when slaked, will swell to two and a half times its originalbulk, and there will always remain a gritty residue, no matter how much watermay be run over it. To Draur a Curve.— Cut a strip of soft pewter, about one sixteenth ofan inch thick, and a quarter of an inch wide, the length of the longest curve. PEWTER STRIP FOR TAKING CURVES. required. Dress it straight, and smooth the edges with a file. By drawingthe strip through the closed fingers of the left hand, or over the thumb, a veryregular curve may be obtained, which can be altered at will till it matches theline to be drawn or copied. For fine or quick curves a lighter strip should beused. To IVIake a Scrap Book.—Scrap books, as they are generally made,are rough, ungainly affairs, caused by the curling of the leaves of the book towhich the scraps are attached. Mucilage, as generally purchased, will pene-trate printing paper and give it a semi-transparent appearance ; so it shouldnot be used. Use good flour paste, and only apply this to the edges and GENERAL MISCELLANY. 255 corners of the scrap to be attached. By this method you will hnd no wrinkling,but have a flat, smooth
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