Catalogue of the Mechanical Engineering Collection in the Science Division of the Victoria and Albert Museum, South Kensington, with Descriptive and Historical Notes: Mining and metallurgical appliances, textile machinery ... telegraphic apparatus, Part 2

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H.M. Stationery Office, 1908 - Machinery - 369 pages
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Page 320 - Esq., for improvements in apparatus for transmitting electricity between distant places, which improvements can be applied, amongst other purposes, to apparatus for giving signals and sounding alarums at distant places by means of electric currents.
Page 71 - ... the slag from the other. This furnace was fitted with a hood-chimney and probably the blast was not introduced at the base but continued to be applied over the rim. This type of furnace, possibly a Roman invention, was not much used afterwards. The bowl-furnace was not very efficient, the chief waste arises from the total loss of the heat escaping from the zone of combustion and from the great loss of metal in the slag. Therefore, the pot-furnace is an improvement. The neck of the bowl-furnace...
Page 127 - R, small worsted bands put about the whirl of the bobbins, the screwing of which tight or easy causes the bobbins to wind up the thread faster or slower, s, the four whirls of the spindles. T, the four Spindles, which run in iron plates, v, explained in letter M. w, a wooden frame of the whole machine.
Page 324 - ... on the margins of the lower half of the dial. To obtain, a closed circuit when the needles were used singly, a sixth lever and line wire were provided. The letters C, J, Q, U, X, and Z were not represented on the dial, other letters or combinations of letters being used instead. 1760. Four-needle instrument. Lent by HM PostmasterGeneral, 1876. M. 1973. This was brought out by Messrs. Cooke & Wheatetone in 1838.
Page 264 - This lathe was constructed at the end of the 18th century, and is believed to be the first workshop machine in which Henry Maudslay combined a leading screw and change wheels for producing screw threads. The bed consists of two triangular bars, secured at a fixed distance apart and supported on feet by which it was secured to a bench ; the height of the centres is 1 • 5 in. and the length of the bed about 3 ft. The headstocks are fixed to the back bar only, but the slide rest, which is of gunmetal....
Page 234 - beaters " of a drum making about 1,000 revs, per min., which carry it round through the space between them and a curved grid, or " concave," which delays its passage to such an extent that the grain is knocked out of the ears of corn and passes through the grid, while the long straw is carried round and delivered at the opposite edge. The grain, chaff, and short straw, after passing through the bars of the concave, slip down an inclined board and are delivered at the higher end of a sloping sieve,...
Page 226 - Lent by LH Pritchard, Esq., 1908. M. 3549. These represent the primitive form of plough used in the rice fields of Siam. They are made entirely of wood and consist of a long curved pole to which a yoke is attached, and a cross piece mortised in at the rear end, the lower end of which carries the ploughshare while the upper end serves as a guiding handle. The share is formed with an upward projection having a curved face which slightly turns the shallow furrow made. The ploughs are drawn by a pair...
Page 233 - ... R. Garrett & Sons, 1894. M. 2679. This model was shown at the 1851 Exhibition and embodies inventions patented in 1843, 1844, and 1850. The drum has five straight iron blades as beaters, and the " concave " is of ribbed iron plates separated by spaces covered with wire screens. The corn is thrashed out of the straw by the rapidly revolving beaters, which knock out the grain as the straw is being carried round in the small space between the drum and the concave, the empty straw finally being ejected...
Page 324 - Five galvanometers or magnetic needles and coils were used, arranged in a horizontal row on the vertical diamond-shaped dial ; stops were placed to limit the deflection of the needles. Each needle was operated by a separate lever fitted with two finger keys, so arranged that a current could be sent in either direction. When signalling two needles were simultaneously deflected in opposite directions, and the point of intersection of their centre lines on the dial indicated the letter to be read off....
Page 271 - The cross slide is supported on and is actuated by two vertical screws connected by bevel gear and shaft fed by hand. The swivelling tool box is on a screw on the cross slide and is fed by a pulley and ratchet actuated by a band from a rocking pulley on the same shaft as a pinion moved by a rack rod with stops on the bed. By guide pulleys the band also turns the tool-holder through 180 deg. at the end of each stroke so as to cut in both directions.

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