656 Report on the Trials of Implements at Reading. 
when worked by hand is from a flj-wheel, by a strap on to a 
pulley. This fly-wheel can be applied on either side of the 
implement, and with one on each side two men can work well 
together. It requires, however, too much power for hand ; 
40 revolutions of the handle give only 400 revolutions of the fan 
per minute, and at this velocity the fan is almost ineffective. 
For steam-power a pulley is fixed on the same shaft as the 
fly-wheel. The machine is mounted on an iron framework 
fitted with four wheels. The flue used in the hay-field was 
an iron tube, resting on the ground. 
The dynamometer trials showed that the power required to 
work the fan open at 800 revolutions per minute was 'SO-horse- 
power ; while to obtain 1000 revolutions, 1'75-horse-power was 
needed. 
Fig. h.— Tk'w ofPMlUps's Fan, No. 5233. 
