Chapter LXII: 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.=

=1264. Rotary screen,= with rolling bevil gear motion. See No. 711.

=1265. Rotary horizontal screen.=

=1266. Shaking or jigging screen.= Sometimes supplied with a blast or aspirator to carry off the lighter particles.

=1267. Eccentric or angular barrel screen or mixer.=

=1268. Air blast sizing or graduating apparatus.=

=1269. Edison’s magnetic sizing apparatus= for iron or steel particles.

=1270. Graduating or sizing screens,= either fixed as shown or kept in motion like No. 1266.

See also Concentrating and Separating, Section 26.