Almost every gauge since 1849 has come with a Bourdon tube inside. It's the metal tube that flexes when put under pressure and causes the needle on the face of the gauge to read the pressure. Here's a copy of his original US patent and some information about him. https://blog.wika.us/products/pressu...bourdon-gauge/ https://bourdonusa.com/products/pressure-gauges https://upload.wikimedia.org/wikiped...ne_Bourdon.jpg
Well, I just learned something. Thanks acptulsa. "What is a Boost Gauge? A Boost Gauge is a pressure gauge, often mounted on a dashboard, radio slot or driver’s side pillar, which indicates boost pressure in an internal combustion engine. They can be imperative for any vehicle running a turbo or supercharger. GlowShift offers a variety of electronically and mechanically driven boost gauges from which you can select the boost or boost/vacuum gauge that will best assist you in monitoring the boost and/or compression levels of your vehicle. Whether a Diesel Boost Gauge, Turbo Gauge or another Gauge-type from our catalog, GlowShift is sure to have the type of Boost Gauge you are seeking."
Thank you. I didn't know that those sturdy old steam pressure gauges worked the same way as vacuum gauges.
Someone told me to make a pressure gauge into a vacuum gauge all you do is reverse some thing in the gauge itself. I wish I could remember. Maybe this will help. https://en.wikipedia.org/wiki/Press...acuum gauge is a,760 mmHg equals total vacuum). https://www.setra.com/blog/vacuum-pressure-what-is-it-how-do-you-measure-it
geoff1944 wrote: "Bourdon's original gauge was not practical for cold climates because the two ends of the tube, or "spring," were pointed down. Condensed water would drain out of the end which was connected to the steam line but would collect in the other end and freeze, bursting the tube. This design is called a "single spring" gauge because the tube is considered to be one "spring." T. W. Lane patented an improvement to the Bourdon gauge in 1859 which solved this problem. Lane oriented the tube so both ends were pointed up instead of down. He then placed the connection to the steam line in the middle of the tube, at the bottom. Condensed water would then run out of both ends of the tube. This is called a double spring gauge because the tubes on either side of the bottom connection are each considered to be a separate spring." "You could just rotate the gauge 90*."_________________ Steven Harrod Lektor Danmarks Tekniske Universitet Institut for Systemer, Produktion, og Ledelse Lane's 1859 patent gauge
The dead weight tester is the accepted way to check the accuracy of a guage. Here is an interesting article about the tester. https://www.instrumentationtoolbox.com/2013/08/how-to-calibrate-pressure-gauge-with.html
I love "patent art". It's beautiful, especially the older patents. Here are some old patents courtesy of google patent. Enjoy! https://patents.google.com/patent/U...auge&q=patents&oq=steam+gauge++patents&page=1 https://patents.google.com/patent/U...auge&q=patents&oq=Ashton+steam+gauge++patents https://patents.google.com/patent/U...patents&oq=Ashton+steam+gauge++patents&page=1 https://patents.google.com/patent/U...patents&oq=Ashton+steam+gauge++patents&page=2 https://patents.google.com/patent/U...patents&oq=Ashton+steam+gauge++patents&page=3 https://patents.google.com/patent/U...patents&oq=Ashton+steam+gauge++patents&page=4 And the link to all the pages. https://patents.google.com/?q=steam&q=gauge&q=patents&oq=+steam+gauge++patents
