Page 23; line 14, foiVr, read b S
a to a, read from d to
m 0, read take twice m a in
13, read it thus:—if you want five tenths of a foot, and five of the hundredth
parts of a foot, place your compafs foot-
19, for any tenth part of an inch,, read anyone hundredth part of a foot.
16, for g, 5, read q—5.
i§, for g, 5, read q—5.
11, for a to «, read d to n.
7?,- 9, for the extreme line P E and P r, read P E and 11.
137,’-- 4, for abacuo, read abacus.
152, Plate VIII, for 7 diameters, read 8 diameters.
162, line 22, Plate XII, for take m 0, read take twice m a in the compafles, and with
this opening find the center of the curve for the abacus as at p on
Fig. B.
10, for from
11, for Plate XV. read Plate XIV
15, for F’g- 23, read Fig. 21.