Page:The Construction of the Wonderful Canon of Logarithms.djvu/68

44 CONSTRUCTION OF THE CANON. three columns, “89 degrees”. On the second page, above, to the left, “1 degree”; and below, to the right, “88 degrees”. On the third page; above, “2 degrees”; and below, “87 degrees” Proceed thus with the other pages, so that the number written above, added to that written below, may always make up a quadrant, less 1 degree or 89 degrees.

Then, on each page write, at the head of the first column, “Minutes of the degree written above”; at the head of the second column, “Sines of the arcs to the left”; at the head of the third column, “Logarithms of the arcs to the left”; at both the head and the foot of the third column, “Difference between the logarithms of the complementary arcs”; at the foot of the fifth column, “Logarithms of the arcs to the right”; at the foot of the sixth column, “Sines of the arcs to the right”; and at the foot of the seventh column, “Minutes of the degree written beneath”.

Then enter in the first column the numbers of minutes in ascending order from 0 to 60, and in the seventh column the number of minutes in descending order from 60 to 0; so that any pair of minutes placed opposite, in the first and seventh columns in the same line, may make up a whole degree or 60 minutes; for example, enter 0 opposite to 60, 1 to 59, 2 to 58, and 3 to 57, placing three numbers in each of the twenty intervals between the horizontal lines. In the second column enter the values of the sines corresponding to the degree at the top and the minutes in the same line to the left; also in the sixth column enter the values of the sines corresponding to the degree