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Full text of "Modern Mechanical Engineering Vol-I"

THE  ELEMENTS

57

is extensively adopted for large cylindrical bodies, which would be most
costly to shape in solid timber, and be very heavy to handle.

Fig. 7.—Skeleton Frame with Dovetailed Corners, and Interior occupied with Loose Boards to Ram upon

(c) Loam Patterns.—These (fig. 9), of cylindrical form, are swept on
bars when they are too small to be swept in loam moulds on bricks, and

Fie. 8.—A Curved Tank Plate with Interior Strickled

too large, having regard to the number of castings required, to bear the cost
of timber and labour.     The field for their employment is thus rather re-

Fig. 9.—A Pattern Column swept in Loam, with Flanges of Wood
stricted.   They are awkward to handle, being heavy, and do not deliver
cleanly from the sand, especially in the cope, because their surfaces are rough,