DDF

On a walk near my home in Dorset uk

Ah, I remember those pesky springs in a Jeffries i bought.Here's a contribution.

Looks like damp air is making the inside of the cover expand at a greater rate than the outside which is probably film coated.

I didn't measure the thickness under the clamps this would be the place to find the original thickness.I would guess they started with two or maybe three gauges of steel before working the tongues .In the Wheatstone workshop film it shows them surface grinding the uncut tongues so I guess they would have have a gauge near to finished size before profiling. The final filing goes right up to the clamps which probably explains the variation in the measurements at Point"1". Regards David.

This may or may not be of interest.These are metric measurements from the reeds in my 1917 Wheatstone Linota.

Snap, Many years ago some friends were coming to visit and picked this up in a charity shop en route. They thought it would be a bit of fun. It is in much worse condition than yours but as mine was was double reeded I hung on to it and it has been "a bit of fun". Regards David.

Ross also sold metronomes.

"German silver"/ nickel silver.

I converted an old 39 lachenal McCann and it is very true that it is only as good as its reeds which were rather average.

You'll find loads of ozone generators/air purifiers on ebay they are pretty cheap as they are quite simple to make. Regards David.

This guys channel is well worth looking through,sorry if its been on here before.David.

Have you ever opened up a concertina and wondered how on earth it came to be full of black dust and muck .The answer might be it was this one mentioned by Walter Wilkinson in his 1927 book The Peep Show."By their conversation they were in a gloomy state of mind and they reminded me of a man I once met who always relieved his low spirits by locking himself in a dark coal cellar and playing a concertina for an hour or two". Walter Wilkinson's 8 books documenting his travels with his puppet show can still be picked up, are all very enjoyable .David.

I think the detector works by induction, it does sense aluminium powder and gold metal.

That reminded me of something that has been on a shelf in the workshop for years.I just dug it out and took a picture I bought it thinking it was gold but when you put a metal detector/stud detector over it it doesn't register.I just put some in a drop of nitric acid and nothing happened so I guess its mica or goodness knows what.I think it was the box it came in mislead me originally.

Try popping it on your kitchen scales then if you depress the key it will show you the pressure you are exerting.