things were expected at its introduction, is the one known as the "Agglomerate block," from the fact that, instead of simply placing the carbon and manganese together loosely in a porous cell, solid blocks are formed by compressing these materials, under a pressure of several tons, around a central carbon core, to which the terminal is attached in the usual manner. The following are some of the compositions used in the manufacture of agglomerate blocks:—
No. 1.
| Manganese dioxide | 40 | parts. |
| Powdered gas carbon | 55 | parts. |
| Gum lac resin | 5 | parts. |
No. 2.
| Manganese dioxide (pyrolusite) | 40 | parts. |
| Gas carbon (powdered) | 52 | parts. |
| Gum lac resin | 5 | parts. |
| Potassium bisulphate | 3 | parts. |
These are to be thoroughly incorporated, forced into steel moulds (containing the central carbon core) at a temperature of 100° C. (212° Fahr.), under a pressure of 300 atmospheres, say 4,500 lbs. to the square inch.
No. 3.
Barbier and Leclanché's Patent.
| Manganese dioxide | 49 | parts. |
| Graphite | 44 | parts. |
| Pitch ("brai gras") | 9 | parts. |
| Sulphur | ⅗ | parts. |
| Water | ⅖ | parts. |