johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Fairly sure I acquired this as part of a stack from a party retiring from Enpro Systems over twenty years ago
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and machinists (press fits)
Every time a new apprentice bought his own 12" rule we used to ask the kid " Have you had that checked out ? ".
Obviously the kid would say " No, I don't think so ".
So we'd reply " You need to get over to the pattern shop son, they have the master rule, they'll check it out for you".
Of course when the kid offered them his rule the pattern shop guys would check it out against their " metal shrinkage " rule.
They'd tell the kid - " You need to take this back to the hardware shop son, look it's wrong compared with our master ".
Much confusion on behalf of the apprentice. We did eventually tell them the truth.
Regards Tyrone.
I had not heard of Chordal Lengths before. I did a little reading.
Chord (geometry) - Wikipedia
Does this Chordal Length chart give you the length of a line inside a circle that runs parallel to a diameter line depending on how many 'slices' you take across the circle parallel to the diameter line?
John,
The top left heading of the Table of Chords is not clearly legible. It seems to say "L-something College T&V Dept."
Or something like that. Any idea what College it is? T&V could be Technical and Vocational.
Thank You for posting this.
John Ruth
John,Lee College - where ever that might be. I think the one Robert E. Lee was president of after his soldiering days was Washington & Lee? Robert passed in 1870 at age 63 looking for all the world like he was at least ninety.
I have from my father a Helios brand sliding vernier caliper, graduated in thousandths of an inch on one edge and 128ths on the other. Probably the one I learned to read a vernier on.
I was having one of my kids check measurements on our never-ending house-building project, a couple of years ago. I told her to grab a 50-fot tape from the cubby where such things are found. She came back very perplexed by the measurement..until I showed her that she had grabbed the feet-and-tenths-and hundredths engineer's tape.
Every time a new apprentice bought his own 12" rule we used to ask the kid " Have you had that checked out ? ".
Obviously the kid would say " No, I don't think so ".
So we'd reply " You need to get over to the pattern shop son, they have the master rule, they'll check it out for you".
Of course when the kid offered them his rule the pattern shop guys would check it out against their " metal shrinkage " rule.
They'd tell the kid - " You need to take this back to the hardware shop son, look it's wrong compared with our master ".
Much confusion on behalf of the apprentice. We did eventually tell them the truth.
Regards Tyrone.
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