86
MOLESWORTH S POCKET-BOOK
Blasting Agents. (Nobel.)
A — Ballistic power, weight for weight.
B= Do. do. bulk for bulk.
W = Relative weight; h, firing heat applied suddenly, Fahr.
G = Specific gravity; H, fifing heat; material heated
gradually.
Material. A B w G h H
Nitro-glycerine .. .. 100 1-00 1-00 1-60 - —
Ammonia powder .. •83 •80 •969 1*55 — —
1 )ynamite •72 •74 1’031 1-65 350° 446u
Lithufracteur .. .. •504 •53 1-06 1-.0 — —
Compressed gun-cotton •71 •44 •625 1-00 300“ 482°
Best blasting powder ■28 •1H •625 1-00 500c
Nitrate of ammonia 80 i
_______1................. zby weight.
Nitro-glycerine 10 to 20 )
’ 75 j ”
2 ]
5 \
23 J ”
70 J
(Andree.)
. . k Filiale u* —----—
Ammonia powder >charcoal .. ..
consists of .. ip- - — - ■
_ ( Porous* silica ..
Dynamite .. Nitro-glycerine
I Coal dust .. ..
Nitrate of barium
Infusorial earth
Nitro-glycerine
Contents of 1 inch of Bore-hole.
Diam. of hole)
(inches) j
Gunpowder oz.
Gun-cotton oz.
Dynamite oz.
1 I H li H I 2 I 2| 21 , 2|
•419] •(
•419; ’U» ------1----, - i „„„
-670'1-046 1-507 2-053l2'680|3'392 4-189|5-066
I _______________ __________________
3
654 ’942 1*283 1 *67512*120 2’618 3'166 3’769
■654 '942 1-283I1-675 2-120 2-618i3,166 3’769
•O-Iß 1 *5O7'2*O53!2*68O 3’392 4’189;5*066 6’030
Waterproof Composition for Submarine Blasting.
1, Tallow; 3, Kosin; 4, Gutta-percha; 12, Swedish pitch.
Dynamite cannot be ignited by a spark or blow, i t is slow to
catch fire. When ignited it burns fiercely, but leaves tame tor
escape; if in large quantity, or confined, explosion may ensue.
In winter dynamite freezes, and the cartridges require cautious
thawing, which should be done in proper pans surrounded by