. Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . COM L 2S5 ] C O M Compafs of iTie compaflTes. The fcrew-pln of the beam paflad II through an adjiifter, by mcansot which the mark ou the Compe- jiiiigc might [,e broiiglit exactly to any divilion. But . J- , tiie proporiional compallts have been nuich out of life fince the invention of the feiSor. Spring Compasses, or dividers ; thofe with anarched liead, which by its fpring opens [he l
. Encyclopaedia; or, A dictionary of arts, sciences, and miscellaneous literature; constructed on a plan, by which the different sciences and arts are digested into the form of distinct treatises of . COM L 2S5 ] C O M Compafs of iTie compaflTes. The fcrew-pln of the beam paflad II through an adjiifter, by mcansot which the mark ou the Compe- jiiiigc might [,e broiiglit exactly to any divilion. But . J- , tiie proporiional compallts have been nuich out of life fince the invention of the feiSor. Spring Compasses, or dividers ; thofe with anarched liead, which by its fpring opens [he legs ; theopening being direL^led by a circular fcrcw faltcned toone of the legs, and let through the other, workedwith a nut. Thefe conipafTcs are made of hardenedfteel. Trifefling Compasses confifi; of two central rnles,and an arch of a circle of 120 degrees, immoveable,with its radius; which is fattened with one of theceniral rules like the two legs of afeclor, that tiie cen-tral rule may be carried through all the points of thecircumference of the arch. The radius and rule fliouldbe as thin as polfible; and the rule fattened to the ra-dius niould be hammered cold, to attain the greaterelafticity ; an
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Keywords: ., bookcentury1700, bookdecade1790, booksubjectencyclo, bookyear1798
