Description of an Autocratic Cock. 315 
Description of ihe Autocratic Cock. 
Let ABC (Plate VIII.) represent the section of a portion 
of a reservoir or liquor-back. DE, a large pipe supplying 
the same. F,acock on which is fixed the large wheel T, 
about two feet diameter, and the small wheel w, about five 
inches diameter: to the former is attached on one side the 
weight G, and on the other the vessel Hs, which is provided 
with the tube so. 7k is a tube to supply the vessel Hs, and 
is moveable on the joint c, to allow the orifice i to be occa- 
- Slonally raised above and depressed below the surface of the 
water, by means of the line or copper chain zw, which is 
fastened to the wheel x. Jm is a slender rod of iron or wood 
moveable on the centre 7: to this, by means of the bar x7, 
is fixed the cork or hollow metal float r, which, for the sake 
of rendering visible, is represented a little below its proper 
Situation. To the end of the rod /m is fixed the wire mn, 
provided with a yalve at 7 and another at s, for the purpose 
of closing alternately the ends of the tube so. The valve n, 
when the apparatus isin the present position, must be as 
much below o as is equal to an are of 90° of the wheel T: 
the tube so must also be equal in length at least to on, that 
the orifice o may fall within the waste-pipe op, which passes 
through and is supported by the bracket gq, which bracket 
Serves also to receive the vessel Hs when it descends. The 
vessel Hs is capable of containing a sufficient quantity of 
water, when about four-fifths full, to overcome the weight G 
and the friction of the cock F: this cock being open when 
the weight rests on the bottom of the back, it 1s evident if 
the vessel H be filled it will descend until it meets the 
bracket gq, by which descent the weight G will be raised 
and the cock shut: the tube z will also, by means of the 
wheel w, be lifted above the surface of the water vi, which 
will prevent any more from running into the vessel H; and 
the application of the orifice o to the valve x will prevent 
that which is already in from escaping until it is again 
opened by tlie descent of the float 7, which cannot happen 
until a portion of the water is drawn off: the valve near s 
prevents the water from escaping while H is filling ; but if 
the 
