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Mark Dionne
Works at CalorieMinder.com
Attended Michigan State University
Lives in Newton, MA
107 followers|43,824 views
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Mark Dionne

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The symbols we use every day have fascinating and surprisingly recent origins, explains author Joseph Mazur in his new book
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Mark Dionne

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Toward the end: Al and Doria Dupere (my dad's second cousins), Al's wife Rita and Rita's mother Hannah Duquette Buote.

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Looks like a rat at 2:02. :-)

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As Einstein once said, any two variables should correlate as highly as possible, but no more so
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The video is great, but it leaves out one important thing: the second solenoid, which was not shown and sits under the electric terminals, routes a small amount of pressurized gas to the bottom of the big diaphragm which effectively operates the main outlet valve (and also regulates the pressure). Gas pressure is used as the operating force for the main valve. This is important on "millivolt" versions of this valve, where a bigger 700 millivolt thermopile provides all the electricity to operate both solenoids. The thermopile would have to be very large to provide enough power to operate the main gas valve all by itself.

190055joe asked how 20 mv can operate the solenoid. The voltage does not "pull in" the solenoid, it just holds the solenoid in its fully-in position. That takes less current/voltage. The solenoid is "pulled in" when the Pilot button is pressed in by the person lighting the pilot.

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Tagline
I like to take things apart.
Education
  • Michigan State University
  • University of British Columbia
Basic Information
Gender
Male
Work
Occupation
Software developer
Employment
  • CalorieMinder.com
    Founder, 2007 - present
  • Kayak.com
    Software Architect, 2009 - 2010
  • Kurzweil Educational Systems
    VP Engineering, 1996 - 2006
  • Interleaf, Inc
    Director Engineering, 1983 - 1996
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Newton, MA
Previously
Westwood, MA - East Lansing, Michigan - Vancouver, British Columbia
They never shovel snow from the sidewalk in front of their building, forcing people to walk in Route 9 traffic. I'm sure this does not bother their customers in their Maseratis, but it's a kick in the face to the other 99%. (They will tell you, like they told me, that it is the responsibility of the landlord. Well they need to twist the landlord's arm or do it themselves.)
Public - a year ago
reviewed a year ago
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