The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

Section 72.—RIDDLING AND SCREENING.

[1256]. Square mesh wire gauze.

[1257]. Perforated plate.

[1258]. Parallel bars or wires.

[1259]. Hexagon or triangular mesh wire work.

[1260]. Slit and square hole perforations, used for seeds, &c.

A form of variable mesh is manufactured by parallel series of diagonal bars jointed by pins to sliding cross-bars, so that the angle of the mesh bars can be altered and thus the spaces reduced or enlarged, on the same principle as [No. 617].

[1261]. Sloping screen.

[1262]. Cylindrical or slope reel screen.

[1263]. Cylindrical graduated screen or sizer.