18° 0' 15° 0' 12° 51.4' 11° 15' 10° 0' 9° 0' 8° 10.9' 7° 30′ 6° 55.4' 6° 25.7' 6° o' 5° 37.5' 5° 17.64'

No. of teeth=N=

d-size of chain

of link of link

No. 62, Supplement to Machinery, October, 1906.