108 Report of a Committee 
one ounce of number 4 shot; the only comparative difference 
I ever observed was that a few more shot were thrown within the 
compass, consequently it may be inferred that my way of loading 
carries closer. No difficulty attends making the cartridges; the 
accompanying No.1 is the exact pattern of the paper, which 
should be thin and soft. No. 2 is the former upon which the 
paperis rolled spirally from the broad perpendicular side, and 
then doubled into the hollow at the end. The cartridges when 
wanted for use may be carried in a common canvass shot bag. 
To conclude: I may mention that this way of loading is very 
general in India, and I doubt not will be approved of in England 
if ever tried. Iam, dear sir, yours very obediently, 
Province of B. .C.S. 
April 1820. 
No. I. 
eee 
XXIII. Report of a Committee of the Academy of Natural Sci- 
ences of Philadelphia, on a new Hydrostatic Balance in- 
vented by Isatan Lukens. Read May 26, 1818*, — 
Tue undersigned Committee beg leave to report, that the in- 
strument invented by Mr. Lukens, and referred to them by the 
Academy, consists of a very sensible steelyard or Roman balance, 
so arranged as to be particularly adapted to the finding of specific 
gravities. The arms of the balance are so constructed, in the 
first instance, as to be in exact equipoise, when unloaded. The 
object [C, fig. 1, Plate II.] of which the specific gravity is to be 
ascertained is suspended to the shorter arm, by any of the usual 
methods ; aud its relative weights iu air and in water are indi- 
cated by the numbers on the graduated arm [A] at which the 
moveable weight or pea [D] is suspended, when the beam is 
brought into a horizontal position. It is evident that the abso- 
lute weight of the pea is arbitrary, and it is one of the advantages 
of the instrument that the pea may be altered to suit the weight 
of the object under trial; even a stone of a proper size might be 
employed, and would always be at hand. 
When great accuracy is desired, a second pea is employed, 
which must be either one-tenth, or one-hundreth part the weight 
* From the Journal of the Academy, Vol. I. Part II. 
of 
