[ 7 8 * ] 
By thefe comparifons it appears, that Snellius’s 
meafure of the London foot, from this iron ftandard, 
was at lead; 3 parts in 1000 fhorter than Graham’s 
London foot. 
Our countryman Norwood, in the year 1635, 
meafured the diftance between London and York, 
in order to determine the length of a degree on the 
meridian j which he found to contain 367196 Lon- 
don feet of this iron ftandard ( 5-). The French found 
the meafure of a degree, in the latitude 6 6° 20', to 
be 57438 toifes, and at the equator 56783. Hence 
the meafure of a degree in 52 0 44' (the middle lati- 
tude between London and York) will be found to 
be 57276 toifes, or 343656 Paris feet. Thefe num- 
bers give the proportion of the Paris foot to that of 
the iron ftandard, as 1065,4 to 997,1 — , wanting 
fomewhat lefs than 3 parts in 1000 of Graham’s 
London foot. 
Picard’s paper De Menfuris, quoted above, and 
another on the fame fubjedt by Auzout, printed with 
it, contain fome meafures, which Greaves had before 
compared with his London foot. Both thefe papers 
were written after the renewal of the ftandard of the 
Chatelet, in 1668. The former is fo full of inac- 
curacies and miftakes, that little ufe can be made of 
it ; but Auzout’ s meafures appear to be accurate ; 
and as he feems to have taken his Paris foot from the 
portion du pied de Paris a celui da Rhin, dont 1 ’original eft a 
Leyde ; laquelle proportion me parut eftre exadlement comme 
720 a 696, au lieu de 720 a 695, que j’avois fuppofee dans la me* 
fure de la terre.” This latter is Huyghens’s proportion. 
(5) See Norwood’s Seaman’s Pradtice. 
5 H 2 
toife 
