( 474 / 
Line with the under-fide of the Cylinder; of the Peece. Then, 
between the Gun and the Mark at feveral places, place pieces of 
Canvas, Sheets of Paper pafted together, or the like, upon 
Stakes fixt in the ground, fo as the under-fide, being level with 
the Horizon, may juft touch the Vifual line , that pafteth from 
the Eye to the upper-fide of the Mark * when the Eye is placed: 
in the Line,, that pafteth from it to the upper-fide of the Cylin- 
der of the Gun } the Canvas being fo broad and long, that, if 
the Bullet pafs through it two or three foot higher than the Le- 
vel of the Mark, or of either hand, the hole it makes, may 
make it known, how much it fiieth higher than the Level of 
that place. Such piece of. Canvas, cN. may be placed .5 one^ at 
half the diftance between the Gun and the Mark} another y 
halfway, between the firft, and the Mark, &c. And if it be 
found, that even at fo fmall a diftance the Bullet falls lower than 
the Mark, if it touch not the Canvas, the Gun may be next time 
taifed a little, and fo on, till the Bullet hit the Mark, or as high 
- as it And if at firftiit fall as high as the Mark and cut the Can- 
vas,, the. Mark and Canvas may be brought neerer the Gun, till 
it needs be done no more : Afterwards the Mark may be remo- 
ved to greater and greater diftances, till, to hit the Mark, it fly 
higher, than fome or all the interpofed Canvafles : And.thus the • 
Experiment is to be repeated and varied at pleafure . 
To know , what Quantity of Fowder^ is the juft Charge of 
' any Peece, fo as it maketh the fartheft Shot, and fires totally. 
T. Raife the Gun to a mean Random, as of 20 or 25 degrees,, 
and Shoot with, the ordinary Charge of Powder, in fome conve- 
nient ground, where the fall of the Bullet may be eafily feen, 
and having made a Shot , meafurethe diftance with.aCbain.be- 
tween the hole made by the Bullet, and the Muzzle of the Gun, 
Then, inftead of a full Charge of Powder ufed in the 
firft Shot, take AA part lefle, or fome fuch proportion, for the 
next try al, doing all things elfe as before. 
§o. For a third , fourth , or: more try als , diminifh ftill the 
Quantity of Powder by ^ at a time, till the Shot he confidera- 
bly; Shorter, than at firft, 
4*. Then take more than the firft Charge, and do all things- 
elfe as before, and fo continue more tryals, increafing ftill the. 
Quantity, of Powder, in the fame proportion,every new tryal, 
till you fkdthdncreafeof the Charge does Qotmake the Peece 
Shoot; 
