This was on a display mannequin in Willemstad Curaçao
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It's a standard Bourdon tube gauge, not a capillary gauge. Capillary gauges do not use a needle, there's just a clear tube with a colored liquid inside, the end of the liquid indicates the depth. They are easy to spot, not just because of the lack of a needle, but because the depths indications get closer as you go deeper.It's a capillary depth gauge, old style. Max depth and no decomp included. Extreme vintage.
You are right, of course. I mixed the two old things up. Defective memory.It's a standard Bourdon tube gauge, not a capillary gauge. Capillary gauges do not use a needle, there's just a clear tube with a colored liquid inside, the end of the liquid indicates the depth. They are easy to spot, not just because of the lack of a needle, but because the depths indications get closer as you go deeper.
This is a capillary depth gauge
You are correct, I missed that. But it's not nearly as dramatic an increase as with the capillary gauge. The formula for any depth marking in bar (approximately 10m) on a capillary gauge (starting at infinite depth) is 1/bar absolute. So 10m is 1/2 the length, 20m is 1/3, 30 is 1/4, 40 is 1/5, etc.The markings get closer together on this gauge too....first circuit is 0-25m, second is 25 to approx 85m.