File:The dictionary of arts, sciences and manufactures embracing in all nearly three thousand articles on arts and sciences (1859) (14767529505).jpg

Identifier: dictionaryofarts02smit (find matches)
Title: The dictionary of arts, sciences and manufactures ... embracing in all nearly three thousand articles on arts and sciences
Year: 1859 (1850s)
Authors: Smith, James, author of the Panorama of science and art
Subjects: Technology Industrial arts
Publisher: Boston, Phillips, Sampson, and Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ll, by the number of the revolutions of which, in a giventime, tlu result desired may be obtained. Instruments havesven been described, which express upon paper, not only thesveeral winds that have blown during the space of twenty-fourhours, but at what hour they began and ended, with thestrength and velocity of each. These contrivances have,however, some defects or inconveniences, which renJer theminferior to the anemometer invented by Dr. James Lind,of Windsor, and of which we subjoin the inventors de-scription from the 65th volume of the Philosophical Trans-actions. This simple instrument (represented by fig. 11, pi. Ill)consists of two glass tubes, AB, CD, of five or six inches inlength.* Their bores, which are so much the better alwaysfor being equal, are each about i4oths of an inch in diameter.They are connected together like a syphon, by a small bent * They ought to be longer, as in several cases the above-mentioned length hasbeen found insufficient. IFiYiBTOflATiRCS. /■;;,/
Text Appearing After Image:
:::,.,,-,,;,/ /.„,/„/,. PNEUMATICS. 39 Liiids wind-gaage. tube a b, the bore of which is -jfoth of an inch in diameter.On the upper end of the leg AB, there is a tube of latten brass,which is kneed or bent perpendicularly outwards, and has itsmouth open towards F. On the other leg CD is a cover, witha round hole G in the upper part of it, T^ths of an inch indiameter. This cover, and the kneed tube, are connected to-gether by a slip of brass c d, which not only gives strength tothe whole instrument, but also serves to hold the scale HI.The kneed tube and cover are fixed on with hard cement, orsealing-wax. To the same tube is soldered a piece of brass e,with a round hole in it, to receive the steel spindle KL, and atf there is just such another piece of brass soldered to the brasshoop g h, which surrounds both legs of the instrument. Thereis a small shoulder on the spindle &tf, upon which the instru-ment rests, and a small nut at i, to prevent it from being blownoff the spindle

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