| Common salt43 | per cent. |
| Alum19.5 | per cent. |
| Glauber’s salt5.1 | per cent. |
| Soda3.5 | per cent. |
| Water glass6.6 | per cent. |
| Water22.3 | per cent. |
Richardson’s Fire-Extinguishing Powder.
| Alum4 1/2 | pounds. |
| Common salt10 | pounds. |
| Glauber’s salt1 | pound. |
| Soda1 | pound. |
| Water glass1 1/2 | pounds. |
Vienna Fire-Extinguishing Powder.
| Green vitriol4 | parts. |
| Ammonium sulphate16 | parts. |
| Water100 | parts. |
Proteau’s Fire-Extinguishing Powder.
| Carbonate of soda8 | pounds. |
| Alum4 | pounds. |
| Borax3 | pounds. |
| Carbonate of potash1 | pound. |
| Silicate of soda solution24 | pounds. |
Mix thoroughly and add 1 1/2 pounds of this mixture to each gallon of water, when required.
Transferring Photographs.