Vintage Scuba: Capillary Depth Gauges – S02E13

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Dive computers are accurate to within one or two feet, however capillary gauges measure depth as “close enough”. Alec shows the evolution of capillary depth gauges using Boyle’s Law of pressure and volume.

*** In this episode of Vintage Scuba ***
– a 1953 US Divers square plastic capillary gauge
– a late 1950’s “Bath-O-Meter”
– how to clean a capillary depth gauge
– Dacor LCG Professional Model depth gauge to 250 feet
– the first dial gauges used bourdon tubes but still had a backup capillary gauge around the dial

***** Alec Peirce Scuba *****

▶︎ Series 6:
▶︎ Series 5:
▶︎ Series 4:
▶︎ Series 1, 2 & 3:

▶︎ Series 3:
▶︎ Series 2:
▶︎ Series 1:

▶︎ Series 2:
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Rating: 5.00

  1. Luis Izquierdo says

    Great video really enjoyed it.

  2. Andrew Reece says

    I'm probably missing something obvious, but how do these stop air from escaping if the device is oriented wrong, while still allowing water in? Thanks!
    EDIT: is it something to do with the size of the opening and surface tension?

  3. ambsviii says

    This capillary dive gauge will be my next DIY project. thank you Alec for your sharing.

  4. James Bond says

    You pronounce it as ka-PILL-ry.
    I would pronounce it as CAP-a-lair-e.

    Is that just a US vs Canada thing ?

  5. Bogy 1 Kinoby says

    "Remember, Water is Blue"
    – Alec Pierce, 2016


  6. Andreas I says

    Great video again! Thanks for that.
    About the bath-o-meter's name: In greek "vathos" means depth. You could spell it "bathos" in latin. So, bath-o-meter literally means depth gauge.

  7. Miguel Gerov says

    Alec, thanks again for sharing the good ol' technologies. Keep them coming.

  8. TheOldManEric says

    Hey Kevin, love your video and sound quality, makes them look really professional. Good work old chap…

  9. Lee Stringfield says

    Alec, you are a living compendium of scuba diving history. The value of these videos, while appreciated today, may surprise you if they resurface a hundred years from now when we are all gone. It is important that you continue to catalogue these for their historic value; you are doing something that nobody else has attempted to my knowledge.

  10. Mike Caira says

    Hi Alec , love all your videos . Maybe its really simple , but could you explain how a J value works? How does turning a valve give you a two or so more minutes of air? It's not like there are different compartments in the tank. Thanks to you and Kevin

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