Question So what is this?

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

JohnN

ScubaBoard Supporter
ScubaBoard Supporter
Messages
2,708
Reaction score
1,602
Location
Oar--eee---gun
# of dives
500 - 999
This was on a display mannequin in Willemstad Curaçao

1674341666439.jpeg
 

MarkA

Contributor
Messages
89
Reaction score
81
Location
Brazil
# of dives
1000 - 2499
It’s a depth gauge. One of those things used before computers.

It has a maximum depth indicator. The red needle and screw used to reset it.

It goes round more than once for depths deeper than 25m.

Don't know what tables the no stop times are from? US Navy?

And it’s metric.

It says Italy, so a guess it was manufactured there.
 

Lorenzoid

ScubaBoard Supporter
Staff member
ScubaBoard Supporter
Messages
12,185
Reaction score
9,578
Location
USA
# of dives
I just don't log dives
The dial indicates minutes along with depth. I'm thinking it's an early decompression-meter.
 

Kupu

ScubaBoard Supporter
Messages
1,124
Reaction score
756
Location
NC
# of dives
1000 - 2499
The no deco limits look like a match for US Navy air tables assuming no residual nitrogen. The minutes remaining would not apply to repetitive dives.
 

agilis

Cat Lives Matter
ScubaBoard Supporter
Messages
11,237
Reaction score
15,584
Location
N.J.
# of dives
I just don't log dives
It's a capillary depth gauge, old style. Max depth needle and no decomp table included. Extreme vintage.
 

lowwall

Contributor
Messages
3,003
Reaction score
3,928
Location
Chicago
# of dives
200 - 499
It's a capillary depth gauge, old style. Max depth and no decomp included. Extreme vintage.
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

il_570xN.4477298641_phku.jpg
 

agilis

Cat Lives Matter
ScubaBoard Supporter
Messages
11,237
Reaction score
15,584
Location
N.J.
# of dives
I just don't log dives
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

il_570xN.4477298641_phku.jpg
You are right, of course. I mixed the two old things up. Defective memory.
 

tursiops

Marine Scientist and Master Instructor
ScubaBoard Supporter
Scuba Instructor
Messages
15,862
Reaction score
15,339
Location
U.S. East Coast
# of dives
2500 - 4999
The markings get closer together on this gauge too....first circuit is 0-25m, second is 25 to approx 85m.

Yes, as @Kupu said, the NDL limits are exactly those of the USN (old) tables: 15m/100min, 18m/60min, 21m/50min, 24m/40min.

1674350258115.jpeg
 

lowwall

Contributor
Messages
3,003
Reaction score
3,928
Location
Chicago
# of dives
200 - 499
The markings get closer together on this gauge too....first circuit is 0-25m, second is 25 to approx 85m.
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.
 
https://www.shearwater.com/products/swift/

Top Bottom