. Glasgow mechanics' magazine; and annals of philosophy . to health, and resists theaction of acids. This glazing is composedof five parts of litharge, two parts of wellpurified clay, and one part of substances are pulverised, and mixedwith a sufficient quantity of caustic alka-line lie (soap-makers liquor), so as to forma mixture fit to be readily applied on theearthenware, and to cover it equally allover. Carefully baked, these wares offerno trace of lead. Published every Saturday, by W. R. M*Phun, 155, Trongate, Glasgow, to whomCommunications (post paid) must be addressed. CUR
. Glasgow mechanics' magazine; and annals of philosophy . to health, and resists theaction of acids. This glazing is composedof five parts of litharge, two parts of wellpurified clay, and one part of substances are pulverised, and mixedwith a sufficient quantity of caustic alka-line lie (soap-makers liquor), so as to forma mixture fit to be readily applied on theearthenware, and to cover it equally allover. Carefully baked, these wares offerno trace of lead. Published every Saturday, by W. R. M*Phun, 155, Trongate, Glasgow, to whomCommunications (post paid) must be addressed. CURLL, PRINTER. THE GIiASGOW MECHANICS MAGAZINE, CONDUCTED BY A Committee of Civil Engineers and Practical Mechanics. Only let men awake, and fix their eyes, one while on the nature of things, another while on theapplication of them to the use and service of mankind. No. CXIII. Saturday, ISth February^ 1826. Price %d. MR. PERKINS MODE OF DRAWING OFF BACK-WAXERFROM WATER-WHEELS. iMMiiKiiiiiiiiiri <<(fl«a i i + + +0 M V + O 0 W + o J .; « + + O + .qi. Vol. IV. 418 THE GLASGOW MR. PERKINS MODE O? DRAWING OFF THE BACK-WATER FROM WATER-WHEELS. the tube, A, and is also in a directline with it. E is an opening be-tween the tub^, A and B; at thisopening the back-water (which hadaccumulated under the wheel whilethe current was cut off by the gate,«,) is canied off by the lateralvelocity of the current which rashesfrom the tubes, A and B. G re-presents the back-water; D, thebulkhead. It will be readily seenthat by opening the gate, a, thewater will rush down the tube, A,and join the back-water at E, andwith it pass off through the tube,B, under the bulkhead, D. Thewater expended in turning thewater-wheel will also be earriedoff by fclre same current throughthe tube, B. This improvement in mills is thatof using part of the superabundantwater in times of floods or fresliets,to fi-ee the water-wheels from theback-water occasioned by suchfreshets. To effect this purpose,the following p
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