In actual blasting work the results vary altogether with the nature of
the material encountered, and with the result that is desired to be
accomplished, viz., throwing out, shattering, or mere displacement.

Chalon gives for quarrying:

Powder 1
Dynamite No. 2, containing 50 per cent. nitro-glycerine 3

For open blasting:

Dynamite No. 3, containing 30 per cent. N.G. 1.0
Dynamite No. 1, containing 75 per cent. N.G. 2.5
Blasting gelatine 3.5

For tunneling:

Dynamite No. 3, containing 30 per cent. N.G. 1
Dynamite No. 1, containing 75 per cent. N.G. 3
Explosive gelatine 19

Finally Berthelot's theoretical calculations give a specific pressure
of--

Powder 1
Dynamite 13
Gun-cotton 14
Nitro-glycerine 16
Blasting gelatine 17