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causes of these inconveniences; which, accordingly, werefound to be in great measure remedied by the following'construction.

The lamp consists of a brass pipe, ten or twelve incheslong, and about a quarter of an inch wide, inserted atone end into the reservoir of the oil, and turned up at theother to an elbow, like the bole of a tobacco-pipe, theaperture of which is extended to the width of near twoinches. On this aperture is fitted a round plate, havingfive, six or seven small holes, at equal distances, roundits outer part, into which are inserted as many pipesabout an inch long : into these pipes are drawn threads ofcotton, all together not exceeding what in the commonlamps form one wick : by this division of the wick, theflame exposes a larger surface to the action of the air, thefuliginous matter is consumed and carried- off, and thelamp burns clear and vivid.

The reservoir is a cylindric vessel, eight or ten incheswide, composed of three parts, with a cover on the top.The middle partition communicates, by the lateral pipe, withthe wicks 3 and has an upright open pipe soldered into itsbottom, whose top reaches as high as the level of thewicks j so that, when this part is charged with oil, tillthe oil rises up to the wicks in the other end of thelamp, any further addition of oil will run down throughthe upright pipe into the lower, division of the reservoir.The upper division is designed for supplying oil to themiddle one; and, for that purpose, is furnished with acock in the bottom, which is turned more or. less, by akey on the outside, that the oil may drop fast enough tosupply the consumption, or rather faster, for the overplusis of no inconvenience, being carried off by the uprightpipe; so that the oil is always, by this means, kept ex-ractl-y at the same height in the lamp. For common uses,

the