Report on the Trials of Implements at Wolverliamj>ton. 485 
are turned round at the ends of the field hy tlic pull of the return rope. The wiud- 
inss has several peculiarities of construction. In the ideal cross-section, Fifj;. 4, 
which is not drawn to any scale, A is the driving-shaft, having at one end a 
Fig. 4. — Ideal Cross-Section of Messrs. Barrows and Stewart's 
dttached Windlass. 
B 
rigger, B, for an engine-belt, and at the other end a coupling, C, for being con- 
nected with the engine crank-shaft by universal joints and a coupling-shaft. 
The machine was driven in this latter way during the trials. A pinion, D, 
gears with a large spur-wheel, E, which is fast upon an axis, ¥ P, mounted 
in brass bearings upon the windlass-frame, Gr G. Hung loose upon this axis 
are the two lope-drums, H and I ; 
and these are set alternately in and Fig. ^.—Diagram of the Br alce-apimra- 
out of gear with the axis by means 
of the ratchet-clutches, J and K, the 
clutches being connected together, 
siided simultaneously, and held in 
any position (that is, in gear with 
one or other of the drums or out of 
gear with both) by the quadrant 
And worm, L, adjusted by the hand 
■set-wheel, M. It will be seen that, 
with this arrangement, it is impos- 
sible for both drums to be in gear 
at one and the same time, and thus 
the risk of wheel breakage is greatly 
reduced. The relative sizes of the 
spur-wheel and pinion are as six to 
one, and each drum is capable of 
receiving 800 yards of l|-inch 
wire-rope. The brake of the slack 
<lrum is thus managed : — The shaft 
carrying the quadrant piece passes through a slot in a loose block of hard 
wood, N in Fig. 5, near the outer rim of the drum flanges, and by means 
