w/s no.19 fitted to M3 Stuart light tank

[Mrs Vampire]

Talking about the insides of M3s I have this interior shot of Sgt Lattimore's Stuart 2017.

There is a filter of some sort right up against the main battery switch box.

From other info that switch was a knife switch that was supposed to be turned on and off.

never seen such a filter/whatever fitted before and have no idea what its for.

The engine compartment shot doesn't quite show if it lines up with a hole in the wall of the fighting compartment. The filter look original 1942 .

anyone have any clues??