Amateur Wood-Workers

1876 Scientific American  
�=== == == == =:= == == == == == == == == == == == = sand is placed in the pan to cause the beam A to nSS'lme 11. 1 The construction is as follows: The small brass wire a' is horizontal position, or to stand in perfect equilibrium. The is suspemled by II. loop of humau hair from the block or' br�ss mineral K is then removed from the upper basket F, and b, much in the same way as the magnet of II. bifilar mag placed in the lower basket G, where it is submerged in the netometer. There is another
more » ... oop of hair passing through a water contained in vessel I. The counterpoise J, with its load from below, and connecting it with the block c, but in such a of pans and granular material, is then moved along the beam manner that there is half II. turn of twist in the two loops of A toward the fulcrum B to II. position S, where it just coun-hair. ba nd c are firmly secured to the iron standard d, which tel' balances the submerged mineral. This position S corre-supports the dial e. Attached to a is the wire f, carrying the sponds wi�h �he . specific gravity of the mineral, and the inde :x; g, which indicates the degree of relative humidity on alllo � nt belllg lD�1(:ated by the graduated scale can be read the dIal e / h is a thermometer, giving the temperature of off dIrect, thus glvmg at It glance the correct E'pecific gravity the surrounding air. The block of wood i, forming the base without regard to the weight or quantity of the mineral K or of the instrument, has II. circular scale upon it marked with other substance under test. percentages from 2 to 100; another circular scale is attached J1l1PROYEMENT IN CA.:MEK\.-OBSCURAS. By '1'_ A. KELJ.ETr, "Yells, Minn. CO�SISTS in an adjustable table, in combination with II. re
doi:10.1038/scientificamerican04011876-212fsupp fatcat:7j47kuqmare5vhpzxqireqvdqa