C 782 3 
toife in the Chatelet for this purpofe, it was probably 
a correct meafure of that ftandard. 
Such of his meafures as anfwer to Greaves’s, are 
here reduced to thoufandth parts of the London 
foot, reckoning his Paris foot to contain 1065,4, 
parts. 
Greaves. 
Auzout. 
Diff. 
Diff. per foot. 
The Statilian foot 
972 . 
969,96 
— 2,04 
2,1 
The braccio of Florence 
I9I3* 
1908,84 
— 4,16 
2,l8 
The braccio of Siena 
I974. 
i973>2i 
— 0,79 
0,4 
Paetus’s palm 
732 - 
73 I >35 
— 0,65 
0,89 
All thefe differences fall the fame way, and fhew, 
that Greaves’s London foot bore a lefs proportion ta 
Auzout’s Paris foot, than that of 1000 to 1065,4. 
The Statilian foot, and the braccio of Florence, give 
the greateft differences ; one is carved in relievo, and 
the other is a rod j fo that both are fubjed to dimi- 
nution, by time and ufe. The palm is engraved ; 
and Auzout, from the deviation of Pastus’s Greek 
and Roman foot, from the common received pro- 
portion of 25 to 24, fufpeded, that the latter was 
lengthened by wear ; if fo, the like muff have hap- 
pened to the palm. How their meafures of the 
braccio of Siena come to differ fo little, I cannot ac- 
count for. But we can draw no certain conclufion 
from this comparifon, till we know whether any, 
and what, allowance is to be made for the di- 
minution or increafe of thefe magnitudes, in the 
interval between Greaves’s and Auzout’s meafuring 
them. 
For this purpofe, I fhall compare Auzout’s mea- 
fures, with thofe taken by P. Revillas, with a cor- 
rect 
