Flexible blade with bold graduations on yellow background for quick accurate readings. Pocket sized for office or home. High-strength case with power retraction operation. A16 BLADE STYLE: Black markings one side only. Consecutive inches to 1/16ths bottom edge, first 12″ to 1/32nds; 16″ centers designated by diamond; every 12th inch in red.
- 1/4 inch wide blade is flexible with bold graduations give quick accurate readings.
- Power retraction operation.
List Price: $ 8.20
Price: [wpramaprice asin=”B00002N7RH”]
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Question by soccer9: What are all lengths that can be measured with 12 inch and 15 inch unmarked straightedges?
Determine all lengths L inches that can be measured with 12 inch and 15 inch unmarked straightedges. The straightedges can not be bent but can be put together one after another. For example, you can measure something that is 27 inches using the 12inch and 15 inch rulers together or you can overlap the two rulers to measure 3 inches.
Answer by Morningfox
With a 12 inch and a 15 inch straightedge, I can build a marked ruler and measure any length at all. Give me a few weeks, and a small machine shop, and I could build a micrometer screw gauge with a precision/accuracy of 0.005 inches. Maybe even better.
And I could also build a precision surveyors chain, suitable for measuring 1000’s of miles if somebody is willing to walk it.
If you don’t give me the machine shop, it might take me a year or so to put one together, starting from raw iron ore and other natural stuff.
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