Besides the ordinary gas filling plants (of which one was completed and two were 80 per cent completed) there was a plant for stannic chloride grenades, one for white phosphorus grenades, and one for smoke shell also filled with phosphorus and a plant for filling incendiary bombs.
Shell are designated by their diameter in inches or millimeters. The approximate amount of toxic gas required for filling each type of shell (10.5 per cent void) is as follows:
| Shell | Phosgene, Pounds | N. C.,[13] Pounds | Mustard Gas, Pounds |
|---|---|---|---|
| 75 mm | 1.32 | 1.75 | 1.35 |
| 4.7 inch | 4.27 | 6.20 | 4.20 |
| 155 mm | 11.00 | 15.40 | 10.35 |
| 8 inch | 22.00 | 30.30 | 21.60 |
| Livens | 30.00 |
The gas grenades held 0.446 pound of stannic chloride, and the smoke grenades held 0.67 pound of white phosphorus.
The only type of shell filled was the 75 mm. variety, because either the shell of the other sizes or the accompanying boosters (bursting charges) were not available.
The work done by the filling plant is shown by the following figures, representing the number of shell, grenades, etc.
75 mm. Shell
| Filled | Shipped Overseas | |
|---|---|---|
| Phosgene | 2,009 | |
| N. C. | 427,771 | 300,000 |
| Mustard gas | 155,025 | 150,000 |
| Livens Drum | ||
| Phosgene | 25,689 | 18,600 |
| Grenades | ||
| White phosphorus | 440,153 | 224,984 |
| Tin tetrachloride | 363,776 | 175,080 |
| Incendiary Drop Bomb | ||
| Mark I. | 542 | |
| Mark II. | 2,104 | |
The total monthly capacity of the filling plants at the date of the Armistice was as follows:
| Pounds | |
| 75 mm. shell | 2,400,000 |
| 4.7 inch shell | 450,000 |
| 155 mm. shell | 540,000 |
| 6 inch shell | 180,000 |
| Gas grenade | 750,000 |
| Smoke grenade | 480,000 |
| Livens drum | 30,000 |