Fig.•5. is a small cock to be placed in the side of the great store-vats, for the purpose of drawing off a small quantity of beer, to taste and try its quality. A is a part of the stave oz thickness of the great store-vat ; into this the tube B of the cock is fitted, and is held tight in its place by a nut a d screwed on withinside. At the other end of the tube B, a plug c is fitted, by grinding it into a cone, and it is kept in by a screw. This plug has a hole up the centre of it, and from this a hole proceeds sideways and corre sponds with a hole made through the side of the tube when the cock is open ; but when the plug c is turn ed round, the hole will not coincide, and then the cock will be shut. D is the handle or key of the cock, by which its plug is turned to open or shut it ; this handle is put up the bore of the tube (the cover E being first unscrewed and removed), and the end of it is adapted to fit the end of the plug of the cock. The handle has a tube or passage bored up it to convey the beer away from thexock when it is open ed, and from this the passage f, through the handle, I leads to draw the beer into a glass or tumbler. The hole in the side of the plug is so arranged, that when the handle is turned into a perpendicular di-I rection with the Passage/ downwards, the cock will be open. The intention of this contrivance is,
that there shall be no considerable projection be yond the surface of the tun ; because it some times happens that a great hoop of the tun breaks, and falling down, its great weight would strike out any cock which had a projection ; and if this happened in the night much beer might be lost be fore it was discovered. The cock above described being almost wholly withinside, and having scarcely any projection beyond the outside surface of the tun, is secure from this accident.
Fig. 7. is a small contrivance of a vent peg, to be screwed into the head of a common cask when the beer is to be drawn off from it, and it is necessary to admit some air to allow the beer to flow. AA re presents a portion of the head of the cask into which the tube B is screwed. The top of this tube is sur rounded by a small cup, from which project the two small handles CC, by which the peg is turned round to screw it into the cask. The cup round the upper part of the tube is filled with water, and into this a. small cup D is inverted ; in consequence, the air can gain admission into the cask when the pressure within is so far diminished that the air will bubble up through the water, and enter beneath the small cup D.