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Convert mm to inches - easy to remember!!
Convert mm to inches - easy to remember!!
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Old 18th July 2019, 10:45 AM   #71
levistubby is offline levistubby  United Kingdom
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Location: Hampshire coast UK
It's certainly not unusual to have rules calibrated 10ths of an inch. I have a 12" stainless steel rule date stamped 1943 that has four scales.

1. 16ths - 32nds - 64ths.
2. 12ths - 24ths - 48ths.
3. 10ths - 20ths - 50ths.
4. cms - mm - 1/2mm.

Those combinations on one rule are a bit unusual I think.

I also have a 12" Chesterman No.412D rule dated 1961. It also has four scales one of which is 12ths - 24ths - 48ths - 96ths on an inch. It is also marked "Standard at 68F"!
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Old 18th July 2019, 03:27 PM   #72
Cal Weldon is offline Cal Weldon  Canada
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Convert mm to inches - easy to remember!!
Originally Posted by levistubby View Post
I have a 12" stainless steel rule
Yes mine was steel as well and had only tenths. I know that scales often have the decimal inches but I figured they just needed to fill up one last side.
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Old 18th July 2019, 03:38 PM   #73
nigelwright7557 is offline nigelwright7557  United Kingdom
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Location: Carlisle, England
For pcb design a electronic calliper metric and imperial is absolutely vital.
Its also handy for conversion between them.
Measure using metric then press mm/inch button and it converts.
PCBCAD51 download or CDROM October 2019 version out now ..https://www.murtonpikesystems.co.uk
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Old 18th July 2019, 04:52 PM   #74
RJM1 is offline RJM1  United States
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Join Date: Jan 2010
Location: Titusville, Fl.
I might be wrong, but I always thought that imperial rulers graduated in 10ths were machinist rulers.
As in take a tenth of an inch off here, Or we milled your cylinder head 5 thousandths..

Last edited by RJM1; 18th July 2019 at 04:59 PM.
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