474 
Report on the Trials of Implements at Cardiff. 
is woven of No. 18 wire there is a larger screening surface in proportion to the 
length than in screens made of stonter wire. The lightness of the cylinder is 
remarkable, and would hardlj' lead one to expect that it could withstand, 
without permanent injury, the violent treatment to which one of these screens 
was subjected in Messrs. Marshalls' threshing-machines, or that it could so 
easily be restored to perfect Avorking by rough and rendy means available on 
any farm. A stone separator is provided as in Hornsby's screen. The corn 
is guided down tlie screen by a sheet-iron Archimedian screw. The cylinder 
is 16 inches in diameter, and at its full length measures five feet long. A 
revolving brush outside the screen rotates by friction, and serves to remove 
the corns that are caught in the meshes. 
No. 965. Coleman and Morton. — This screen differs altogether in its construc- 
tion from the general type of rotary screens, it is e:jternally a twelve-sided 
Fig. 34. 
barrel, composed of six double sections. One of these sections is shown in 
the upper illustration, and consists of a steel mid-rib and two outer bars of 
steel, connected by a series of cross bars, loosely riveted at each end. The 
construction of the screen is shown in the lower figure, where the meshes have 
been set as closely as possible, and three of the double sections have been 
removed to show the position of the parts. 
Fig. 35. 
The main frame _consists of three castings. A, B, and C, carried upon thei 
central spindle ; two of these castings, A and B, are keyed to the spindle, and 
connected together by six longitudinal bars, D, bent to the proper angle to 
form a twelve-sided figure, and secured iu the middle by being riveted to the 
central ring, E. The third casting, C, has six arms, which receive the heads, 
M, of the mid-ribs ; it slides with a play of 4 inches upon the spindle, and is 
moved bj'- the hand wheel, F. The pin, N, at the other end of the. mid-rib, 
slides through the flange of the casting, A ; an eye under the centre of each 
mid-rib slides upon the pins attached to the centre ring, E, The outer bars^ 
