October 1, 1909.
“LIST OF PERMISSIBLE EXPLOSIVES.
“Tested prior to October 1, 1909.
“The following list of permissible explosives tested by the United States Geological Survey at Pittsburg, Pa., is hereby published for the benefit of operators, mine owners, mine inspectors, miners, and others interested.
“The conditions and test requirements described in Explosives Circular No. 1, issued under date of May 15, 1909, have been followed in all subsequent tests.
“Subject to the provisions named below, a permissible explosive is defined as an explosive which is in such condition that the chemical and physical tests do not show any unfavorable results; which has passed gas and dust gallery tests Nos. 1 and 3, as described in circular No. 1; and of which, in test No. 4, 1½ pounds (680 grams) has been fired into the mixture there described without causing ignition.
“Permissible explosives tested prior to October 1, 1909.
“[Those reported in Explosives Circular No. 1 are marked *.]
| Brand. | Manufacturer. |
|---|
| * Ætna coal powder A | Ætna Powder Co., Chicago, Ill. |
| Ætna coal powder AA | Do. |
| * Ætna coal powder B | Do. |
| Ætna coal powder C | Do. |
| Bituminite No. 1 | Jefferson Powder Co., Birmingham, Ala. |
| Black Diamond No. 3 |
Illinois Powder Manufacturing Co., St. Louis, Mo. |
| Black Diamond No. 4 | Do. |
| * Carbonite No. 1 |
E. I. Du Pont de Nemours Powder Co., Wilmington, Del. |
| * Carbonite No. 2 | Do. |
| * Carbonite No. 3 | Do. |
| * Carbonite No. 1-L. F. | Do. |
| * Carbonite No. 2-L. F. | Do. |
| * Coalite No. 1 | Potts Powder Co., New York City. |
| * Coalite No. 2-D. | Do. |
| * Coal special No. 1 | Keystone Powder Co., Emporium, Pa. |
| * Coal special No. 2 | Do. |
|
* Collier dynamite No. 2. |
Sinnamahoning Powder Manufacturing Co., Emporium, Pa. |
| * Collier dynamite No. 4. | Do. |
| * Collier dynamite No. 5. | Do. |
| Giant A low-flame dynamite. | Giant Powder Co. (Con.), Giant, Cal. |
| Giant B low-flame dynamite. | Do. |
| Giant C low-flame dynamite. | Do. |
| * 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: