eae 
G.—A fmall adjufting fcrew, by turning of which 
the ftyle may be inftantaneoufly moved back to the 
beginning of the index, when, in land-meafuring, 
the given line has been afcertained in chains, 
links, &c. . 
H.—A crofs or fquare, with fights for determin- 
ing, in land-meafuring, the perpendiculars:—fuf- 
pended at its ends on the axis, and occafionally to 
be detached therefrom, when ufed, with a touch 
only of the finger and thumb. Jt furthermore acts 
(by the lower end of the ftyle F. embracing alfo its 
ftandard) in preventing the faid ftyle from being 
carried round by any poffible accident with the 
axis, as it revolves; which, before it was ufed, had 
fometimes taken place, and greatly embarraffed the 
account :—and as the 320 divifions, marked poles 
on the index of the axis, are calculated for the de- 
{cribing an exaét mile, the ftyle F. having pafled 
over them, will then {crew no further; but moving 
round withthe axis, takes with it the ftandard, and 
ftriking it on the wrift of the operator, prevents the 
poffibility of his proceeding farther, till he has 
drawn his hand from between the faid ftandard and 
the axis:—having, in road-meafuring, received the 
neceffary hint, he turns the fcrew G, puts back the 
ftyle F to the bottom of the index, and goes on as 
before. ——N. B. The {tandard of the crofs, divided 
into five lengths, occafionally fubftitutes the ten-link 
rod ufed for meafuring offsets, &c. and is alfo ufed 
for fmall diftances inacceffible to the wheel. 
