Railway Master Mechanic, Volume 31880 |
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Popular passages
Page 50 - The wood is then washed over with this liquid, by means of an ordinary whitewash brush, the latter being passed two or three times over the surface, so that the wood may absorb as much of the solution as possible. When this first coating is nearly dry, the wood is painted with the lime-wash in the usual manner. A solution of the silicate, in the proportion of...
Page 88 - ... be inspected in such manner as shall be prescribed by the board of supervising inspectors and approved by the Secretary of Commerce, so as to enable the inspectors to ascertain its tensile strength, homogeneousness, toughness, and ability to withstand the effect of repeated heating and cooling...
Page 12 - ... so as to catch the whole flow. If the tree is a large one, four or five gashes may be cut in a circle around the trunk. On the next day other gashes are made a little below these ; and so on until the rows reach the ground. By eleven o'clock the flow of milk has ceased, and the seringueiros come to collect the contents of the cups in calabash jugs.
Page 31 - Hints to users of belts. — 1. Horizontal, inclined and long belts give a much better effect than vertical and short belts. 2. Short belts require to be tighter than long ones. A long belt working horizontally increases the grip by its own weight. 3. If there is too great a distance between the pulleys, the weight of the belt will produce a heavy sag, drawing so hard on the shaft as to cause great friction at the bearings ; while, at the same time, the belt will have an unsteady motion, injurious...
Page 12 - Now he takes his mould — in this case a wooden one, like a round-bladed paddle — washes it with the milk, and holds it over the smoke until the liquid coagulates. Then another coat is added ; only now, as the wood is heated, the milk coagulates faster. It may take the gatherings of two or three days to cover the mould thickly enough. Then the rubber is still dull white ; but in a short time it turns brown, and finally almost black, as it is sent to the market. The mass is cut from the paddle...
Page 49 - The invention of the mould carried this last application to perfection, and the terra-cottas of antiquity were as numerous and as cheap as the plaster casts now sold by itinerants. The materials used for writing on have varied in different ages and nations. Among the Egyptians slices of limestone, leather, linen, and papyrus, especially the last, were universally employed. The Greeks used bronze and stone for public monuments, wax for memorandums, and papyrus for the ordinary transactions of life....
Page 50 - ... with a very small quantity of the necessary water until a complete mixture is produced, and then adding the remainder of the water, in successive quantities, until a perfect mixture in the requisite proportions is obtained. The wood is then washed over with this liquid, by...
Page 49 - A treatise on the composition and use of medicines, be they old or new; on the construction and use of ploughs, or watches, or churns; or on the mixture and application of colors for painting or dyeing; or on the mode of drawing lines to produce the effect of perspective, — would be the subject of copyright; but no one would contend that the copyright of the treatise would give the exclusive right to the art or manufacture described therein.
Page 12 - Our hostess has brought in her day's gathering — a calabash full of the white liquid, in appearance precisely like milk. If left in this condition it coagulates after a while, and forms an inferior whitish gum. To make the black rubber of commerce, the milk must go through a peculiar process of manufacture, for which our guide has been preparing. Over a smouldering fire, fed with the hard nuts of the tucuma palm, he places a kind of clay chimney, like a wide-mouthed, bottomless jug.
Page 88 - The manner of inspecting and testing boiler plates, intended to be used in the construction of marine boilers, by the United States inspectors, shall be as follows, viz: " The inspector shall visit places where marine boilers are being constructed, as often as possible, for the purpose of ascertaining and making a record of the stamps upon the material, its thickness and other qualities. To ascertain the tensile strain of the plates, the...