<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span></span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span id="yui_3_16_0_ym19_1_1532973557740_9983">Fresh water: .433psi per foot</span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span id="yui_3_16_0_ym19_1_1532973557740_9982">Salt water: .445 psi per foot</span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span><br></span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span id="yui_3_16_0_ym19_1_1532973557740_9966">If there was no gasket sealing the acrylic/glass cover and bezel then it's likely condensation caused the wrinkling of the label.</span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span><br></span></div><div id="yui_3_16_0_ym19_1_1532973557740_9790"><span id="yui_3_16_0_ym19_1_1532973557740_9984">Jon</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1532973557740_9791"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1532973557740_9841" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1532973557740_9840"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1532973557740_9839"> <div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9838"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1532973557740_9842"> <hr size="1"> <b id="yui_3_16_0_ym19_1_1532973557740_9986"><span style="font-weight:bold;" id="yui_3_16_0_ym19_1_1532973557740_9985">From:</span></b> Douglas Suhr via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Monday, July 30, 2018 1:16 PM<br> <b id="yui_3_16_0_ym19_1_1532973557740_9988"><span style="font-weight: bold;" id="yui_3_16_0_ym19_1_1532973557740_9987">Subject:</span></b> [PSUBS-MAILIST] Mechanical Depth Gauges<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1532973557740_9843"><br><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9844">All, as you may've been aware, in late 2015 I purchased Snoopy (a<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9845">K-250) from Alec Smyth. Regrettably I have been quite neglectful of<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9846">performing much upkeep on the sub, save for keeping the batteries<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9847">topped off. My schedule is finally allowing me to spend some real time<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9848">working on the sub and getting to know the specifics of each system.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9849"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9850">As you can imagine, I've been bugging Alec with a question here and<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9851">there, but thought with this topic I should start a discussion here on<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9933">the list for the benefit of anyone else who might have questions /<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9934">curiosities about mechanical depth gauges.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9935"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9936">Snoopy's depth gauge is nice and large (about 5" in diameter) so it's<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9937">easy to read. Alec created a nice label for the gauge face which reads<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9939">from 0 to 300 (in feet) with the last fifty feet being marked in red<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9879">to indicate 'too deep.'<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9953"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9952">Problem is, when I looked at the depth gauge the other day, I noticed<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9951">that the transparent cover plate on the gauge looked to be quite<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9853">opaque (to the point where I couldn't quite read the numbers or count<br></div><div dir="ltr">the hash marks). I assumed that there was some moisture trapped in the<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9989">gauge, causing the obscuration. I decided to remove the gauge from the<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9940">sub and open it up to let it dry out.<br></div><div dir="ltr"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9990">After removing the gauge from the sub, I unscrewed three small screws<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9991">around the bezel and popped off the transparent cover plate. It was<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9866">only then that I realized the opaqueness was not caused by moisture<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9992">but a distortion in the clear plastic. The distortion (like super fine<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9993">scratches) appears to be on the outside of the cover, as though it was<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9947">cleaned by something that started to melt the plastic or was left out<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9941">in the sun too long. I don't think either of these explanations make<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9942">sense, but I'm puzzled as to what might have caused it. I might try to<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9943">buff / polish the plastic, or perhaps just replace it with glass.<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9944"><br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9945">I think it's a good idea to stick a dive computer in viewing range of<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1532973557740_9949">a viewport for a depth reading, but I like the idea of having a<br></div><div dir="ltr">mechanical gauge in the sub as well. A couple of questions that come<br></div><div dir="ltr">to mind: what is the pressure variation between salt water and fresh<br></div><div dir="ltr">water? Also, although I didn't find moisture in the gauge, The label<br></div><div dir="ltr">on the face is wrinkled a bit as though it has seen moisture. Although<br></div><div dir="ltr">water should never actually reach the gauge, I can see how moisture<br></div><div dir="ltr">from the inlet tube could find its way up into the gauge body. Should<br></div><div dir="ltr">I be concerned about drying it out somehow after a dive (especially in<br></div><div dir="ltr">salt water)? If so, how should I go about it? ~ Doug S.<br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Personal_Submersibles mailing list<br></div><div dir="ltr"><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br></div><div dir="ltr"><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></div><br><br></div> </div> </div> </div></div></body></html>