Trials of Implements at Carlisle. 
Area dug per liour, if wo allow furrows to l)e 200| 
yards lono;, and su])posiug i minute lost at the end I 
of each furrow from the time digger stops till it | 
starts to work again J 
Average indicated horse-power while working at this) 
rate, allowing nothing, however, for moving anchors^ 
1-22 acres. 
34-9 h.-p. 
Comparison of Economic Performances of Darby's Digger loitli those of 
other Diggers, so far as regards the power required to dig 1 lb. of 
earth. 
Indicated Work of 
Engine in Foot-lbs. 
per 1 lb. of Eartb 
moveJ, or Height to 
which Earth most 
be raised to repre- 
sent Work done. 
Daeby Diggee at Carlisle, July 10, 1880 
Fowler Digger „ „ worked by 
Burrell's engine and tackle. (N.B. This should not 
be taken as an official trial, as the implement was 
only lent to the Judges of the R.A.S.E. by Messrs. 
Fowler, to enable them to institute a comparison, 
and it was not worked by their own tackle) .. 
[*Fowler's 6-Furrow Digger at Stafford 
Howard's 
Fowler's 
„ Wolverhampton, 
worked by Fisken Roundabout Tackle (mean ]of 
5 trials at various speeds) 
18-2 
24-4 
21-8 aver- 
age. 
21-8 
21-9] 
Fig. 7. — Specimen Diagram from Darby s Broadside Digger Engine in 
full Worh, digging. 
Scale 40 lbs. to 1 inch, 180 revolutions per minute, 115 lbs. 6tcam, engine cylintlcr 9 in. diameter, 
12 in. stroke. 
* Extracted from Table III., Wolverhampton Trials, 1871. 
