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Map planimeter for measuring actual distances and areas on maps.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...l_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...r_map_tool.jpg
Previously:
https://www.homemadetools.net/forum/...483#post122679
https://www.homemadetools.net/forum/...2866#post77013
All they gave us to use was these
Attachment 33179
but military cartographers are among the best in the world when it comes to producing arcuate topographic maps from surveillance photos
The device is called an opisometer.
https://en.wikipedia.org/wiki/Opisometer
I haven't seen one of those since 1970's in the Air Force. We had cartographers working with us with flight simulators. Making huge glass maps hand painted down to items the size of fence posts, the map covered sometimes 500 miles or more.
Wow, I still have one of these in my desk!
Green's theorem notwithstanding, it's not clear to me how one measures area with an opisometer, which measures linear dimensions. Typically area measurements are made with a device called a planimeter. Here's a good description of the device, including some pictures, history, use and its relation to Green's theoremQuote:
Originally Posted by Altair
AMS :: Feature Column from the AMS
Of course, if you're out camping in the forest and have an urgent need to calculate an area, you can always use your pocket knife as a planimeter...
https://www.spaco.org/Blacksmithing/...Planimeter.htm
Whoa , that's funny, the Map shown above, this is the place where I grew up, well, 20km above the town up right on the map.Quote:
Originally Posted by Altair
This is what we call here a "curvimètre", not that uncommon, this is still sold and you can event get the digital high tech version :
https://www.amazon.fr/curvimetre/s?k=curvimetre
