W. Crookes on the Wax-paper Photographic Process. 159 
the bore, and was covered but } inch deep with powder—th 
_ orifice facing toward the muzzle of the gun. The momentum 
of the gases rushing forward in the explosion seems to have re- 
lieved the instrument from a part of the pressure sustained by 
the sides of the bore at the same distance from the bottom 
he variations of pressure sustained by the gun when fired 
_with charges very nearly the same, are greater, as might be ex- 
ected, than the variations of initial velocity imparted to the 
under similar circumstances. When the combustion of the 
action on the ball is not so well sustained as in the case in 
which the combustion is more slow and consequently longer 
continued. 
The { following svi of initial eae of 6 pdr. balls, extracted 
from a table in Major Mordecai’s “Second Report” a his ex- 
periments on mere aor will ee for the compariso 
Initial velocities of balls fired from a 6 pdr. gun, 
x Powder. ~___ Shot, Titial 
; Weight.| Height | We ghi We ght. _Dinm.— Velocity. 
lbs. ia. A, Tes 5 ila _— Ift.pr.sec’d. . 
1 4 611 358 |} 1594 
15 48 615 f i 1 
15 49 613 e 94 
16 6 26 * 153 q 
15 687 | * | 1°98 ent Seg 
15 63 - 1520 | 3 
a : ‘Ae, xt se Dedeviption of the Wax-paper process peblames 4 for 
the’ chow So i Ae ro at the Radcliffe Ubserv 
Ek sae by oS KES, Esq.* 
EFORE attem ting to seledt from the numerous Photo- 
- thse ‘best adapted to the. requirements of 
‘ pa ee it was necessary to take into consideration a num- 
ber of circumstances, ~stawre a wad unimportant in ordinary 
_ operations. — 
To “ of any valu 
continuously : 
TSetet. "Therefore, the process adopted must be one combining 
sharpness of definition, with extreme sensitiveness, in order to 
? mark accurately the minute and oftentimes sudden variations of 
the instruments. 
ees. the Astronomical and Meteorological Observations made at the Radcliffe 
: Oherr Oxford, in the year 1854, under the superin of Manuel J. 
MA » Radelifle Observer. Vol. X 
,, the records must go on ‘heeasiigy and 
V. Oxford: 
