index below it; the dial B 1 will be moved forward through three divisions; C 1 through nine divisions, and so on; and in like manner the dials of the row D 3 will be moved forward through the number of divisions expressed at the indices in the row D 4 . This change will convert the arrangement into that expressed in fig. 4, the dials to which a carriage is due, being distinguished as before by (*).
The fourth quarter of a turn of the axis will move forward one division all the dials marked (*); and the arrangement will finally assume the form exhibited in fig. 5, in which the calculation is completed. The first row T in this expresses the fifth power of 7; and the second expresses the number which must be added to the first row, in order