*Masurite M. L. F. | Masurite Explosives Co., Sharon, Pa.
*Meteor dynamite. | E. I. Du Pont de Nemours Powder Co.,
| Wilmington, Del.
Mine-ite A. | Burton Powder Co., Pittsburg, Pa.
Mine-ite B. | Do.
*Monobel. | E. I. Du Pont de Nemours Powder Co.,
| Wilmington, Del.
Tunnelite No. 5. | G. R. McAbee Powder and Oil Co.,
| Pittsburg, Pa.
Tunnelite No. 6. | Do.
Tunnelite No. 7. | Do.
Tunnelite No. 8. | Do.
------------------------------+-------------------------------------

“_Provided:_

“1. That the explosive is in all respects similar to sample submitted
by the manufacturer for test.

“2. That No. 6 detonators, preferably No. 6 electric detonators
(double strength), are used of not less strength than 1 gram charge,
consisting by weight of 90 parts of mercury fulminate and 10 parts of
potassium chlorate (or its equivalent), except for the explosive
’Masurite M. L. F.,’ for which the detonator shall be of not less
strength than 1½ grams charge.

“3. That the explosive, if frozen, shall be thoroughly thawed in a
safe and suitable manner before use.

“4. That the amount used in practice does not exceed 1½ pounds (680