Strange Jewel Gauge

[jdrichard]

Just bought this tool and am wondering how to use it. Says it’s a Elgin National Jewel Pin Gauge…but not sure how it would be used to measure the jewel diameters or the hole size.

[Neverenoughwatches]

52 minutes ago, jdrichard said:

Just bought this tool and am wondering how to use it. Says it’s a Elgin National Jewel Pin Gauge…but not sure how it would be used to measure the jewel diameters or the hole size.

Can you give an idea of scale please JD.  I wondering if this is only part of the gauge.

[jdrichard]

4 minutes ago, Neverenoughwatches said:

Can you give an idea of scale please JD.  I wondering if this is only part of the gauge.

 

All I have was the pucture

[RichardHarris123]

I think it's diameters but not sure. 

[Neverenoughwatches]

7 minutes ago, RichardHarris123 said:

I think it's diameters but not sure. 

It looks like there should be a marker that slides up the scale to give a measurement  ie. 30 = 0.3mm 40 = 0.4mm . I'm thinking the pin is missing

[RichardHarris123]

The close up seems to have  Striations

Edited May 22, 2023 by RichardHarris123
Typo again.

[jdrichard]

23 minutes ago, Neverenoughwatches said:

It looks like there should be a marker that slides up the scale to give a measurement  ie. 30 = 0.3mm 40 = 0.4mm . I'm thinking the pin is missing

Hopefully not

[Neverenoughwatches]

2 hours ago, RichardHarris123 said:

The close up seems to have  Striations

Aye matey, its ribbed for her pleasure.  Some kind of clicky thingy . Maybe something slides down the gauge. Ooo er i say Mmmatron.

[HectorLooi]

Maybe it should come with a tapered pin. The jewel hole is slid down the pin until it comes to a stop, then placed beside the rule to get the corresponding hole size.

If that's the case, then JD, will have to turn a wire to the correct taper in order to use the gauge.

[JohnR725]

the problem with pictures their flat can we have a side view please. Like for instance does it have a taper from one end of the other not visible in a flat photograph

[Marc]

Is the graduated part of the gauge tapered?

I'm wondering if you slide it between the fork horns of your pallet fork (with safety pin removed) to measure the gap and determine what size impulse jewel (or pin) you should use.

[JohnR725]

1 minute ago, Marc said:

(with safety pin removed)

you wouldn't want to do that it's a pain to put those back where you found them.

Then the annoyance is I've seen the tool before and I see how it's used just can't quite remember and definitely don't remember where I saw it being used

[jdrichard]

I’m going to look in my old watchmakers catalogue fo an example

[nickelsilver]

This is for measuring the fork slot to find an appropriate roller jewel. It's tapered, you find the step that just fits in the fork slot, then choose a jewel about 0.02mm (for pocket watch) smaller.