[ 7^4 ] 
9 London inches are equal to 8,447 P ar is inches and 
decimals. Hence the meafure of this door-cafe 9 Lon- 
don inches within the jambs, fhould, according to 
Defgodetz, be 18,3676 Paris feet and decimals. But 
19,602 is to this number, as 1065,4 to 998,3 and 
Greaves’s London foot wanted 1^0 t0 be t0 Defgo- 
detz’s Paris foot, in the proportion of 1000 to 1065,4. 
Greaves fays, mod of the white marble ftones on 
the pavement of the Pantheon contained exactly 3 of 
thofe Roman feet on Coffutius’s monument (8). 
Their Paris meafure, according to Defgodetz, is 
2 feet 81 inches, which is equal to 2885,46 London 
parts. This number divided by 3, gives but 961,82 
fuch parts j whereas Greaves’s meafure of the Coftu- 
tian foot was 967 parts of his London footj which 
muft therefore have wanted above 5 parts in 1000 of 
the proportion before-mentioned. But it is probable 
they meafured different ranges of thefe ftones. 
The meafure of the Paris foot, which Greaves re- 
ceived from Monf. Hardy, was taken from the old 
ftandard in the Chatelet (9)* an d contained 1008 
fuch parts as his London foot contained 1000. Thefe 
numbers are in the proportion of 1065,4 to 997 T 7 » 
therefore, if the new ftandard did not differ from 
this old one (and no fuch difference appears to have 
been intended), Greaves’s London foot muft have 
been 2,43 parts in 1000 fhorter than Grahams. 
(8) Greaves, p. 21 1. 
(9) See Monf. Hardy’s Letter, in Greaves’s Works, p. 44 - 7 - 
r Ihe meafure he fent was only half the Paris foot; but he tells 
Greaves, it was taken from the ftandard, under his own infpe&ion* 
with great care. 
