Steam Engine foe Pumping" r, fTate~,. 865

journal for May, 18S~, p. ~41.) M. G. has recently communicated to the Academy of Sciences, some additional interesting infm'mation on this subject. I te states that M. Rouard, director of a manufac- tory of white lead, caused all his workmen to take the sulphuric acid lemonade, and fi'om that moment lead colic ceased to nceur among the men in the establishment. During two months, only four work- men were slightly att~eted with lead colic, and this exception is ex- plained by circumstances peculiar to these workmen. But, he adds, that at the same time that these results have confi.'med the utility of the measure, as regards colic, six of the workmen were attacked with symptoms hitherto regarded as the effects of lead colic, as cramps, muscular debility, and nervous epileptic symptoms. These symp- toms, M. Gendren ascribes to a layer of oxide and carbonate of leatl, combined with the epidermis, l'his observation he considers as ac- countinz for many symptoms hitherto difficult of explanation, and points out the origin of the relapses and symptoms which so often supervene after the cure of col its in workmen habitually exposed to the powerful action of the causes of the disease. He further adds, that whether the sulphuric acid be used as a prophylactic or remedy, it must be employed externally, as well as internally. Conformably to this indication, the workmen in the establishment of M. Rouard, at the same time that they take the sulphuric acid lemonade as drink, use lotions of the same to the surface of their bodies.--.,2merican .lournal of the Medical Sciences, Feb. 7~ 18S5.

On a Steam Engine.for Pumping Water. By W. L. WrixUTO~.

In this engine, the steam is admitted fi'om the boiler upon a deep float, occupying tile top of a column of water contained in a metallic cylinder, placed in the flue of the boiler fire. The lower part of the column of water is connected by pipes to the under side of a piston, moving water tight in a much smaller cylinder, fixed immediately above the pumps of any mine, to the rods of which is affixed the pis- ton rod. By this arrangement, the steam always acts upon a i!eated surface, and its power is applied to the pump rods without the inter- vention of a main beam, parallel motion, &c., and, consequently, without any expense for frame-work, and buildings requisite fbr their support, in other engines. The friction of this engine, moreover~ is very trifling, a stratum of oil being introduced both above and be- low the piston. A. rod, or wire, is attached to the float, and passing through a stutting box in the top of the large cylinder, works the hand gear at the proper periods after the admission and escape of the steam, and consequent depression and elevation of the water and float, within that cylinder. A condensing apparatus may be added, by which the atmosphere may be rendered available, in addition to the weight of the pump rods, to force down the piston in the small cylinder, and, consequently, the water and float, to the top of the large cylinder, after each stroke of the engine.

[ Rcp. I3'rit. ,~ssoc.