Catalogue of the Collections in the Science Museum South Kensington With Descr
Catalogue of the Collections in the Science Museum South Kensington With Descr
Science Museum Great Britain
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Posts and caps are 8 in. By 8 in. , sill piece, 6 in. By 8 in. Inside dimensions of the sets are at the top 4 ft. 6 in. , height, 6 ft. 6 in. , bottom, 5 ft. The space between the lagging and slate rock is filled in with waste rock. Inv. 1915382. S. M. 713 L. S. 79. MODEL OF FOUR - PIECE LEVEL SET FOR SIDE PRESSURE. (Scale 1 : 12. ) Made in the Museum, 1915. This model represents special joints and framing of the timbers for side pressure and swelling ground. By this method, the full strength o...f the timbers is obtained with very little tendency to slip or split, and the pressure up to the point of crushing serves to bind the set together. Dimensions : Posts, 7 ft. 9 in. By 8 in. By 8 in. ; cap, 5 ft. 4 in. By 8 in. By 8 in. ; sill, 5 ft. 5 in. By 8 in. By 8 in. ; lagging, 8 in. By 2 in. ; inside dimensions of the sets, 5 ft. By 6 ft. 6 in. The framed sets are placed 4 ft. Apart. Heavier timbers are used where the pressure is very great. Inv. 1915427. S. M. 737 L. S. 80. MODEL OF " PENNING " METHOD OF TIMBERING.
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