24 : Dr. Hur ton's Project for a 
quadrantal arc 78539'81634, the firft column may be conti- 
nued up to 78540. The fecend column to contain the cor- 
refponding degrees, minutes and feconds to the neareft fecond, 
or to the true feconds and decimals of a fecond, for the conve- 
nience of eafily changing the tables from the one meafure to 
the other, or to make them anfwer to both methods; and the 
3d, 4th, sth, &c. columns to contain the correfponding -_ 
tangeuts, fecants, &c. 
5. The tables may be difpofed as at prefent, namely, conti- 
nuing them downwards by the left-hand fide of the pages, as 
far as to the middle of the quadrant, and then returning them 
again backwards and upwards by the right-hand fide of the 
pages. 
6. In this difpofition, the numbers on the fame line, an one 
on the left and the other on the right, will be exact comple- 
ments of each other to a quadrant, and the decimal :63268, in 
every number in the latter half quadrant, in each page, namely, 
either at the bottom of the column, or length-ways on the 
fides of it. I | 
77 A 
