Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Old calculators.

egansen Member Posts: 31
edited December 2019 in THE MAIN WALL
Went to an estate sale last weekend and ran across a pile of engineering calculators that covered a wide array of subjects. The engineer and preservationist in me couldnt pass them up. In the pile were these that are heating and cooling related and thought the group might find these interesting. Some are definitely dated. The steam cost calculator prices oil between 4 to 20 cents a gallon and gas between 10 cents and $1.50 per 1000 cubic feet. Coal was between $4 and $30 per ton. Last time we bought coal for our steam tractors it was over $200 per ton. I hope listing these prices is ok. If not I will remove them.


  • Zman
    Zman Member Posts: 7,572
    Those are cool. Can I have them? :)
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
    What calculators that slide? How rudimentary :blush:

    Nice find! I love auctions and estate sales.
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,543
    Great find! You reminded me of this story. Thanks.
    Retired and loving it.
  • egansen
    egansen Member Posts: 31
    Zman I'm going to hang on to these. I never know what I'm going to get drug into. That's a cool story Dan. I've just started getting into the estate sales. It's fun like a big scaverger hunt but can be hard on the checkboook.
  • MotoMan
    MotoMan Member Posts: 9
    That's a great find. I remember my grandfather having a few slide charts for working on small engines. I'd honestly rqther go back to that than rely on the internet.