_______________________________________________________

______________
|
|    deg.C. 
Nitro-glycerine, 5 years old (a single drop taken)        | 203-205
Gun-cotton (compressed military cotton, sp. gr. 1.5)      | 192-201
Air-dried gun-cotton, stored for 4 years                  | 179-187
Ditto, stored for 1 year                                  | 187-189
Air-dried collodion-cotton, long  staple “Red Island      |
cotton,” 3 years old                                    | 186-191
Air-dried collodion, 3 years old, stored wet              | 197-199
Hydro-nitro-cellulose                                     | 201-213
Kieselguhr dynamite, No. 1                                | 197-200
Explosive gelatine                                        | 203-209
Mercury fulminate                                         | 175-181
Gunpowder (shell)                                         | 278-287
Hill’s picric powder (shells) Been in store 10 years.     | 273-283
Ditto (musket)                Composed of—­               | 282-290
Ammonium picrate    42.18 % |
Potassium picrate   53.79 " |
Charcoal (alder)     3.85 " |
________ |
|
99.82   |
Forcite, No. 1                                            | 187-200
Atlas powder (75% NG)                                     | 175-185
Emmensite, No. 1              Sample had been stored in   | 167-184
magazine for some months in |
a wooden box.               |
"       No. 2      Stored in tin case.                 | 165-177
"       No. 5        "            "                    | 205-217
__________________________________________________________|_

_________
|         |
|    deg.C.   |
Powder used in Chassepot rifle    |   191   |  By Leygue & Champion. 
French gunpowder                  |   295   |      "          "
Rifle powder (picrate)            |   358   |      "          "
Cannon                            |   380   |      "          "
__________________________________|_________|_______________

_________

Horsley’s apparatus consists of an iron stand with a ring support, holding a hemispherical iron vessel or bath in which solid paraffin is put.  Above this is another movable support, from which a thermometer is suspended, and so adjusted that its bulb is immersed in the material contained in the iron vessel.  A thin copper cartridge-case, 5/8 inch in diameter and 1-15/16 inch long, is suspended over the bath by means of a triangle, so that the end of the case is just 1 inch below the surface of the molten material.  On beginning the experiment of determining the firing point of any explosive, the material in the bath is heated to just above the melting point; the thermometer is inserted in it, and a minute quantity of the explosive is placed in the bottom of the cartridge-case.  The initial temperature is noted, and then the cartridge-case containing the explosive is inserted in the bath.  The temperature is quickly raised until the contents of the cartridge-case flash off or explode, when the temperature is noted as the firing point.