engravings give views of opposite sides of the machine, view at H. Two columns of figures can be operated upon at of the box, which is divided 2s shown. the converse operations of addition and subtraction being per- once, as it is just as easy, by this machine, to add 386 to 47, as formed on the… … 2; the next, those from 8 to 300, divisible by 3; and so on to the outer concentric row, which contains the numbers from This arrangement cnables the box to be made in halves An external rim or hoop, A, is fastened to a bifurcated 12 to 1,200, divisible by 12. As the revolving disk is rotated and…
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