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 5 that pafleth from 
the Eye to the upper- fide of the Mark ^ when the Eye is placed 
in the Line, that paffethfrom it to the upper-fide of the Cylin- 
der of the Gun 5 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 flieth higher than the Level of 
that place. Such piece of Canvas, ^c. may be placed 5 one^ at 
half the diftance between the Gun and the Mark^ anether^ 
half way between the firft, and the Mark, d/^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 
raifed a little, and fo on, till the Bullet hit the Mark, or as high 
as it : And if at firft it fall as high as the Mark and cut the Can- 
vas, the Mark and Canvas may be brought neerer the Giin, 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 pleaJure , | 
To know 3 what ^antity of Tomder^ is the jufi Charge of 
any Peece, fo asit maketh the fartheft Shot, and fires totally. ^ 
r. Raife the Gun to a mean KdXidom^ as of ao or 25 degrees, 
and Shoot with the i?r^/?^r^Charge of Powder, infomeconve- : 
nient ground, where the ftll of the Bullet may be eafilyfoen, \ 
and having made a Shot 5 meafure the diftance with a Chain^be;- ^ \ 
tween the hole made by the Bullet, and the Muzzle of the Gun. \ 
2, Then, inftead of a full Charge of Powder ufed in the j 
firft Shot, takei^; part lefle, or fome foch proportion, for the 1 
next tryal, doing all things elfe as before» . \ 
3, For a third, fourth^ or more tryals^ diminifli ftill the ^ 
Quantity of Powder by ^ at a time, till the Shot be confiderar- , 
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 find the increafc of the Charge does not mtake^ the Peece ] 
Shoot: \ 
