Appleton's Dictionary of Machines, Mechanics, Engine-work, and Engineering, Volume 2

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D. Appleton, 1874 - Mechanical engineering
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Page 294 - ... what I claim as my invention, I wish it to be distinctly understood that I do not limit myself to the precise form...
Page 97 - A second bleaching liquid is now to be added, made by diluting muriatic acid with thrice its bulk of water, and dropping into it pulverized red lead, till the last added portions do not become white. Of this acid bleaching liquor, small quantities at a time are to be added to the...
Page 97 - Of this acid bleaching liquor, small quantities at a time are to be added to the half-bleached lac solution, allowing the effervescence, which takes place on each addition, to cease before a fresh portion is poured in. This is to be continued until the lac, now white, separates from the liquor. The supernatant fluid is now to be poured away, and the lac is to be well washed in repeated waters, and finally wrung as dry as possible in a cloth.
Page 34 - In very damp or windy weather the ether should be very slowly dropped upon the ball, otherwise the descent of the thermometer will be so rapid as to render it extremely difficult to be certain of the degree. In dry weather, on the contrary, the ball requires to be well wetted more than once, to produce the requisite degree of cold.
Page 97 - The inclination of the reflector that is in general most pleasing is 18, 20, or 22, or the 20th, 18th and 16th part of a circle ; but the planes may be set at any required angle, either by a metallic, a paper, or cloth joint, or any other simple contrivance. When the two planes are put together, with their straightest and smoothest edge in contact, they will have the form shown in figure 1, where ABC is the aperture or angle formed by the plates.
Page 279 - The modulus of the elasticity of any substance is a column of the same substance capable of producing a pressure on its base which is to the weight causing a certain degree of compression as the length of the substance is to the diminution of its length.
Page 251 - From eight times the chord of half the arc, subtract the chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearly.
Page 97 - ... animal charcoal, when a small quantity of the solution should be drawn off and filtered ; if not colourless, a little more charcoal must be added. When all colour is removed, press the liquor through silk, as linen absorbs more varnish, and afterwards filter it through fine blottingpaper.
Page 251 - Or, as 360 degrees is to the number of degrees in the arc of the sector, so is the area of the circle to the area of the sector.
Page 265 - In its ordinary state at common temperatures, it is tough, and with difficulty broken by blows of the hammer. It becomes very brittle when its temperature approaches that of fusion, which is about 773; but at a temperature a little above 212, and between that and 300, it becomes ductile and malleable, and may be rolled into thin leaves, and drawn into moderately fine wire, which however, possesses but little tenacity. When a mass of zinc, which has been fused, is slowly cooled, its fracture...

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