. Appleton's dictionary of machines, mechanics, engine-work, and engineering. is a copper-colored mineral foundin Westphalia, and called kupfernickel, nickel being a term of detraction used by the German miners,who expected from the color of the ore to find that it contained copper. The salifiable oxide of nickelconsists of 30 nickel + 8 oxygen. Its salts are mostly of a grass-green color, and the ammoniacal solu-tion of its oxide is deep blue, like that of copper. See Metals and Allots. NONAGON. A figure of nine angles and nine sides. The angle at the centre of a nonagon is 40°,the angle subt
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. is a copper-colored mineral foundin Westphalia, and called kupfernickel, nickel being a term of detraction used by the German miners,who expected from the color of the ore to find that it contained copper. The salifiable oxide of nickelconsists of 30 nickel + 8 oxygen. Its salts are mostly of a grass-green color, and the ammoniacal solu-tion of its oxide is deep blue, like that of copper. See Metals and Allots. NONAGON. A figure of nine angles and nine sides. The angle at the centre of a nonagon is 40°,the angle subtended by its sides 140°, and its area when the side is 1 = 61818242, consequently thesquare of the side X 61S18242 will give the area of the figure. NORMAL. A term sometimes used for perpendicular. In the geometry of curve lines, the normalto a curve at any point is a straight line perpendicular to the tangent at that point, and included betweenthe curve and the axis of the abscissa. NUT-CUTTING MACHINE—By A. Milne, Glasgow. This is a very convenient tool in works sr f. where the chief business is the construction of the morefinished quality of machinery. In these the nuts are usu-ally dressed to correspond with the other parts of the is not commonly employed by millwrights, although itsuse would often be a material saving of time in the fitting-shop, and especially in out-door work, in reducing the nuts,and consequently the number of keys required, to a fewdefinite sizes. Fig. 2974 is a side elevation. Fig. 2975 an end eleva-tion. Fig. 2976 a general plan of the machine. a is the main-spindle, having a spur-wheel w, and thecutter x, keyed on it. k, the driving-shaft, carrying fast and loose pulleys, andhaving the pinion p keyed on it, and which geers into thewheel w. r, the nut-holder : the nuts are screwed on a pin whichis tightened by a nut on the under side, seen in Fig. 2974,by a counter-nut; different sizes of these mandrel-pinsor screws are of course required
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
