Quote:
Originally Posted by Zakopious
Historically, The planimeter was used to measure the area drawn on a steam engine indicator card.
The measurement could then be used to determine the efficiency of the steam engine and indicate potential problems within the steam engine.
If a paper model designer wanted to know the minimum number of pages which would hold the model, the sum of the areas of all of the parts would indicate the theoretical minimum number of pages which could hold the model.
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https://www.farmcollector.com/steam-...gine-indicator
Antique tractor operators need them. Years ago, I used to see steam indicators at flea markets and 2nd hand stores fairly frequently, now I have not seen one for awhile.
https://archive.org/details/descriptionofcro00cros
This link goes direct to a PDF of a steam indicator user's manual
https://www.google.com/url?sa=t&rct=...zbWvlcVKuGzMkG
If you can find and build Ed Bertshy's paper stationary steam engine, you will need a steam indicator and planimeter to determine its efficiency and power output.
https://www.youtube.com/watch?v=gdgu4rfjPug