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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
er of forms of drawbridges. a is a swinging span made up of panels of trusses. b is a span on the Bollman principle across the Mississippi at Quincy, Illinois. c is a pivot-bridge of the New York Central Railway on the Linville principle. d is a swinging bridge on the Linville principle; it is one span of several across the Missouri River. e is a bridge on the bowstring principle across the Harlem River, New York. Plate XLI. is a view of the Swing Bridge of the Amsterdam, Utrecht, and Cologne Railway, over the Yssel near Westervoort, in Holland. It shows the swinging span, gatekeeper's house, land spans for carrying off water at spring floods, ice-breakers in the stream and on the lowlands. In the distance are the dunes of the coast. Piv′ot-broach. （Watchmaking.) A fine broach or tool for opening the pivot-holes of watches. Piv′ot-drill. （Watchmaking.) A bow-drill used in making the pivot-holes in plates of watches. Piv′ot-file. （Wa
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
n enlarged view of the circular bed. A swing-bridge on a large scale was constructed on the Great Western Railway of Ireland, to cross the entrance to Lough Atalia. It has two spans of 60 feet each, and is balanced on a central pier of 34 feet diameter. See Humber, On iron bridges. Fig. 6122 is the iron swing-bridge over the entrance-lock to the West India Docks, London. Swing-bridge, London dock entrance. Plate XLI., page 1721, is a view of a swing-bridge on the Amsterdam, Utrecht, and Cologne Railway where it crosses the Yssel, near Westervoort, Holland. Fig. 6123 is a view of the swing section of the Mississippi bridge at Keokuk, Iowa. Swin′gel. The swinging piece of a flail. The swipel. Swing′ing-boom. （Nautical.) The span which distends the foot of a lower studding-sail. Swing′ing-saw. A saw swinging in an arc from an axis overhead. A weight assists in the effective stroke. (Fig. 6124; see also Fig. 6127.) Swing-jack. A jack fo
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
stery of Augustines, at Windsheim, in the province of Overyssel, was desirous of erecting a windmill. When the lord of Woerst heard of this he forbade it, on the ground that the wind of Zealand belonged to him. Appeal was taken to the Bishop of Utrecht, who flew into a towering passion, and declared that no one had power over the wind within his diocese but himself and the Church at Utrecht. He granted letters-patent, and the mill was erected. It is stated that the first mode adopted to prUtrecht. He granted letters-patent, and the mill was erected. It is stated that the first mode adopted to present the vanes towards the wind was to float the mill and turn it in the water, as occasion required. The next was to put it on a post, and turn the building on this, as an axis. This was called the German method. The next was to turn the cap, or roof. This was a Dutch invention, in the sixteenth century. See windmill-cap. The principal parts of the common windmill consist of an axle, inclined to the horizon at an angle of 8° to 15°, and carrying at its outer end four sail-frames,