| Hours. | Mean result of Readings. Lbs. | Mean Strength of the Paper. Lbs. |
| 8 | a 14·1 | 12·1 |
| b 10·1 | ||
| 10 | a 15·4 | 13·2 |
| b 10·9 | ||
| 19 | a 16·5 | 14·0 |
| b 11·4 | ||
| 21 | a 15·2 | 14·0 |
| b 12·8 | ||
| 33 | a 13·4 | 12·4 |
| b 11·4 | ||
| 35 | a 14·5 | 13·6 |
| b 12·7 | ||
Tests for Strength on Papers, Sized only.
| Hours. | Mean result of Readings. Lbs. | Mean Strength of the Paper. Lbs. |
| 8 | a 22·7 | 20·0 |
| b 17·3 | ||
| 10 | a 28·5 | 23·2 |
| b 18·0 | ||
| 19 | a 22·5 | 21·0 |
| b 19·5 | ||
| 21 | a 26·0 | 21·7 |
| b 17·5 | ||
| 33 | a 15·0 | 15·0 |
| b 15·0 | ||
| 35 | a 14·2 | 15·3 |
| b 16·5 | ||
Tests for Strength on Paper Sized and Glazed.
| Hours. | Mean result of Readings. Lbs. | Mean Strength of the Paper. Lbs. |
| 8 | a 25·8 | 23·6 |
| b 21·4 | ||
| 10 | a 28·4 | 23·6 |
| b 18·9 | ||
| 19 | a 27·0 | 22·9 |
| b 18·9 | ||
| 21 | a 24·9 | 22·7 |
| b 20·6 | ||
| 33 | a 16·1 | 15·2 |
| b 14·4 | ||
| 35 | a 17·5 | 16·2 |
| b 15·0 | ||
It may also be noticed that the strength of the finished paper after twenty hours' beating, as in class B, is equal to that of the paper after nine hours' beating, as in class A. This is curious, especially in view of the fact that the percentage of gelatine in the papers of class B. is only 4·4 per cent. as against 6·0 per cent. in class A.
The relation of the percentage of gelatine to the period of beating thus becomes a matter of interest, and well worth investigation. The figures are suggestive of further experimental research along definite lines.