----+------+------------+----+----+-------+-----+-------+----------
| | | | | | LOAD. |
| | |Age |Area|Density+-----+-------+
| | | in | in | lbs. | |in tons|
| |Dimensions |days|sq. | per | in | per |
No. |Marks.| in inches. | * |ft. |c. ft. |tons |sq. ft.| REMARKS.
----+------+------------+----+----+-------+-----+-------+----------
VW1 | 1 | 8.9x9x8.5 | 1 |.555| 106 |0.45 |0.81 |Cracked at
| dry | | | | | | | one corner
| | | | | |0.51 |0.92 |Collapsed
| | | | | | | |
VW2 | 2 | 9x9x9 |26 |.562| 105 |2.15 |3.84 |Collapsed.
| dry | | | | | | | Material
| | | | | | | | quite dry
| | | | | | | | in interior
| | | | | | | |
VW3 | 3 |9.1x9.1x8.9 | 1 |.570| 134 |0.55 |0.96 |Collapsed
| wet | | | | | | |
| | | | | | | |
VW4 | 4 |8.8x8.8x8.9 |26 |.546| 110 |3.20 |5.86 |Collapsed.
| wet | | | | | | | Material
| | | | | | | | quite dry
| | | | | | | | in interior
| | | | | | | |
VW5 | 5 | 9x8.9x9 | 1 |.558| 126 |0.60 |1.08 |Bulged and
|medium| | | | | | | cracked
| | | | | |0.69 |1.24 |Collapsed
| | | | | | | |
VW6 | 6 | 8.8x8.8x7 |26 |.546| 109 |3.33 |6.10 |Collapsed.
|medium| | | | | | | Material
| | | | | | | | slightly
| | | | | | | | damp in
| | | | | | | | the interior
----+------+------------+----+----+-------+-----+-------+----------
[*: Age after arrival at laboratory.]
Seal of
NATIONAL PHYSICAL LABORATORY _Signature of Director_
"From the second set of blocks it would appear that it is better to ram
with too much moisture than with too little. It will be noted that the
density of the wet block was 30 per cent. more than that of the dry
block, so that a wall could be carried higher with the dry material than
with the wet, although such a wall would never gain the strength which a
wet one would upon drying.