Marconi Record 'G' clamp - UK Vintage Radio Repair and Restoration Discussion Forum

sparkymike · 28th Jul 2023, 8:58 pm

I picked up one of these clamps today. Anyone know what they were used for in the Marconi works ? The large canister is sprung loaded, so pressure would still be applied if the item in the jaws reduced in thickness (shrunk) a little.
Mike.

Dickie · 28th Jul 2023, 9:34 pm

They were the business end of the Marconi moisture meter range, TF933 and its variants. You put the sample to be measured in the holder, squashed it as far as you could, and the instrument measured the conductance of the sample.

sparkymike · 29th Jul 2023, 8:40 am

Thanks Richard. In that case I doubt if I will ever use it for its original purpose, but could be useful to put a constant pressure on wooden items to ease excess glue out of a joint.
Mine is missing the extra bar, but the bolt holes are there and Marconi ident.plate has gone.
Mike.

Dickie · 29th Jul 2023, 11:27 am

Unless you happen to be an arable farmer you won't have much use for it. Back in the 50's, 60's and even 70's they were the gold standard that every farmer relied on to know when his grain (and even tobacco) was dry enough to be stored.

factory · 29th Jul 2023, 12:47 pm

Some of these TF933 meters seem to still be in use, lots of info here; https://thefarmingforum.co.uk/index....surance.73614/

David

Lodekka · 18th Nov 2023, 7:51 pm

I can repair and calibrate Marconi Moisture Meters. If you have no use for the G clamp assembly then I could find a home for it...

28th Jul 2023, 8:58 pm	#1
sparkymike Heptode Join Date: Dec 2006 Location: Colchester, Essex, UK. Posts: 995	Marconi Record 'G' clamp I picked up one of these clamps today. Anyone know what they were used for in the Marconi works ? The large canister is sprung loaded, so pressure would still be applied if the item in the jaws reduced in thickness (shrunk) a little. Mike. Attached Thumbnails

28th Jul 2023, 9:34 pm	#2
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,445	Re: Marconi Record 'G' clamp They were the business end of the Marconi moisture meter range, TF933 and its variants. You put the sample to be measured in the holder, squashed it as far as you could, and the instrument measured the conductance of the sample. __________________ Regards, Richard, BVWS member

29th Jul 2023, 8:40 am	#3
sparkymike Heptode Join Date: Dec 2006 Location: Colchester, Essex, UK. Posts: 995	Re: Marconi Record 'G' clamp Thanks Richard. In that case I doubt if I will ever use it for its original purpose, but could be useful to put a constant pressure on wooden items to ease excess glue out of a joint. Mine is missing the extra bar, but the bolt holes are there and Marconi ident.plate has gone. Mike.

29th Jul 2023, 11:27 am	#4
Dickie Octode Join Date: Sep 2004 Location: St. Albans, Hertfordshire, UK. Posts: 1,445	Re: Marconi Record 'G' clamp Unless you happen to be an arable farmer you won't have much use for it. Back in the 50's, 60's and even 70's they were the gold standard that every farmer relied on to know when his grain (and even tobacco) was dry enough to be stored. __________________ Regards, Richard, BVWS member

29th Jul 2023, 12:47 pm	#5
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,524	Re: Marconi Record 'G' clamp Some of these TF933 meters seem to still be in use, lots of info here; https://thefarmingforum.co.uk/index....surance.73614/ David

18th Nov 2023, 7:51 pm	#6
Lodekka Diode Join Date: Jul 2018 Location: Luton, Bedfordshire, UK. Posts: 3	Re: Marconi Record 'G' clamp I can repair and calibrate Marconi Moisture Meters. If you have no use for the G clamp assembly then I could find a home for it...