SHORT: Hellige Comparator
Our Own Devices
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Ever wonder how a rotary telephone works, how sailors and pilots navigated by the stars, or how mechanical calculators perform complex math using only gears? Then you've come to the right place! Our Own Devices is a channel dedicated to the fascinating world of vintage technology, and the many elegant and ingenious ways our ancestors solved even the most complex technical problems. Want more fascinating history? I am a regular staff writer for Today I Found Out and many of its sister channels: https://www.youtube.com/@TodayIFoundOut I also have a historical adventure novel titled 'Our Own Devices' set in 1920s Morocco. Check it out at my personal website: www.gillesmessier.ca And finally, I make 1920s/30s-style Art Deco posters, which you can purchase on my Etsy store: https://www.etsy.com/ca/shop/DecoEchoes
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Designed to measure the pH and chlorine concentration of drinking water, the Hellige-type comparator works by comparing the colour of a water sample treated with a suitable indicator (bromothymol blue or tolidine) with a rotating disk of standard colour references. Chemical Weapon Detection Kits Videos: https://youtu.be/DViWRTxz6PQ https://youtu.be/P0D4Ph_yRYM https://youtu.be/tAgXfVXcVRM SOURCES https://patents.google.com/patent/US2167060A/en?q=(colour)&assignee=hellige&oq=hellige+colour https://patents.google.com/patent/US2247008A/en?q=(colour)&assignee=hellige&oq=hellige+colour https://www.canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-ph.html https://www.gov.nl.ca/ecc/files/waterres-training-adww-2016-07-brenna-farmer.pdf https://www.safewater.org/fact-sheets-1/2017/1/23/what-is-chlorination#:~:text=A pH between 6.5 and,pH is preferred for disinfection. https://mycompanies.fandom.com/wiki/Wallace_&_Tiernan_Company https://www.etsy.com/ca/listing/1010821818/vintage-gadget-tool-hellige-comparator https://aquaanalytic.ae/brendy/wallace-tiernan/ https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/ph.pdf?sfvrsn=16b10656_4#:~:text=In water with a buffering,higher pH in limestone areas. https://www.gracesguide.co.uk/Wallace_and_Tiernan https://www.ebay.com/itm/174267049109
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