| Ashes, dry ----------------------------------------- |
33 |
| Ashes, moist--------------------------------------- |
36 |
| Ashes, wet----------------------------------------- |
30 |
| Asphalt--------------------------------------------- |
45 |
| Clinders, dry--------------------------------------- |
33 |
| Clinders, moist------------------------------------- |
34 |
| Clinders, wet--------------------------------------- |
31 |
| Clinders and Clay--------------------------------- |
30 |
| Clay------------------------------------------------ |
45 |
| Coal, hard----------------------------------------- |
24 |
| Coal, soft------------------------------------------ |
30 |
| Coke----------------------------------------------- |
23 |
| Concrete------------------------------------------- |
30 |
| Earth, loose---------------------------------------- |
28 |
| Earth, impact-------------------------------------- |
50 |
| Garbage------------------------------------------- |
30 |
| Gravel--------------------------------------------- |
40 |
| Ore, dry ------------------------------------------- |
30 |
| Ore, damp----------------------------------------- |
37 |
| Rubble---------------------------------------------- |
45 |
| Sand, dry------------------------------------------ |
35 |
| Sand, damp---------------------------------------- |
40 |
| Sand, with crushed stone------------------------- |
27 |
| Stone---------------------------------------------- |
30 |
| Stone, broken-------------------------------------- |
27 |
| Stone, crushed------------------------------------- |
30 |
