Does anyone have any information on this? It looks like a T era item.
Have you Googled the make and model? Sometimes that brings up nothing, sometimes a little information, sometime a lot.
Have not been able to find a thing.
Load testing a battery flows a lot of amperes that'll generate heat very soon - i'd suggest you renew the cables before trying it out
It's getting harder to find regular 6V batteries with visible connections between the cells (at least over here) - It looks like this one is for checking each 2V cell individually, so no use on modern style batteries where the connections are hidden.
See: Page 318 Automobile Topics 5 June 1920 -ABC Battery Discharge Set is Portable Outfit.
There appears to be a resistance or reactor core missing. Angle bracket with the +.
I will see if I can find that tonight.
Also - see Motor Age - page 248 - 6 April 1922 - Advertisement with picture. Missing on your illustration adjustable graphic disc.