Cartridges
The cartridges were bigger than might be expected and made of brass. The quality was excellent in the early days but fell off towards the end. You will often see them being sold in antiques shops and booter. Most people think they are cannon shell but the base is marked "Crt Elec St" which gives a clue there is a range of ops so something No 9 mK 2 for example.
Cartridges or cartridges depending on the type were held in a fitting at the front centre of the intake fronted by a large knurled knob suitable for hand operation. The knob had a button in the centre. To undo the fitting bash the knob in firmly and unscrew the fitting about five turns. The fitting and attached cartridge may now be withdrawn and a new cartridge fitted to the claws. Replace is revers. We normally carried a rack of six cartridges in the rear hatch.
We were fond of borrowing the cartidges which could be cut down to excllent ash trays or fitted with a handle and plated to make a beer mug. Mostly we kept the cartridges which had special significance such as after an accident or the last one on retirment. No one seemed to mind where they went, there was no obvious auditing or recording.