Sight Glasses & Plaques?

[Matchless]

what was that large pool there? under water training? may not have been ESAB but near by,

 

[Brad93]

what was that large pool there? under water training? may not have been ESAB but near by,

No idea? You’ve got the arsenal/munitions factory sites up the road near to Waltham abbey with the deep pools that tested torpedos and depth charges

https://en.m.wikipedia.org/wiki/Waltham_Abbey_Royal_Gunpowder_Mills

fascinating place, I’ve had a right wander around As I was introduced to some of the volunteers getting the ammunition train up and running again.