| Iron filings | 140 |
| Hydraulic cement | 20 |
| Flint-sand | 25 |
| Sal-ammoniac | 3 |
This powder is made into a paste with vinegar. It must dry for a long time before being submitted to heat.
Another cement of the same kind is as follows:—
| Iron filings | 180 |
| Clay | 45 |
| Salt | 8 |
This is also made up with vinegar, and must be dried for a long time.
To set iron in stone:—
| Iron filings, fine | 10 | |
| Calcined gypsum | 30 | |
| Sal-ammoniac | 0 | .5 |
Also combined with vinegar.
When there are defects in iron castings, they may be filled up with the following cement:—
| Clean iron filings | 100 | |
| Flowers of sulphur | 0 | .5 |
| Sal-ammoniac | 0 | .8 |