[ 2 9 2 ] 
height of the water makes a difference of about t 5| 
tons in the weight of the fhip. Into this upright 
trough water was poured to the height of 36 inches j 
and the block being immerged, the water was raifed 
9 -j inches : fo that the block was equal in magni- 
tude to a parallelopipedon of 14 inches long, 6 j* 
inches wide, and 9 -3 inches deep, or to 849 f cubic 
inches : from whence I find the weight of the fhip 
to be 1562 tons, 1 C. 2 qrs. 16 fo. And altho’ I 
take this number to be neareft the truth, yet it may 
be obferved, that it is no eafy matter to come at ac- 
curacy in this fubjedt by any of the methods in com- 
mon ufe. 
My next inquiry was, to find how much of this 
weight was lifted, and how to proportion it among 
the fcrews and mawl-men : but in this, lefs accuracy 
mufl be expedted than in the preceding inquiry ; for 
the exadt number of men employed is not known ; 
neither can it be told, how many worked at the 
fcrews, and how many with the mawls ; and only 
a guefs can be made at the part lifted. However, 
fomething may be gathered, which may, perhaps, be 
worth the knowing. 
Let the weight raifed be taken at half the weight 
of the fhip ; for 64 feet, the length of the keel 
raifed, is not far from half the whole length : add 
to this the fally of the head, the weight of the 
forecaftle, the fridtion of the timber, and the refin- 
ance of the parts bent by the cambering : befide, the 
mawls worked at feveral fhoars fet up abaft the faid 
64 feet. 
Now the weight by the laft experiment was 
3499064 pounds: one half, or 1749532 lb. I take 
to 
