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Inside -- Outside Calipers
Direct reading
calipers allow for a quick visual check of measurements like the
distance between a barrel channel and ramrod grove.
![](../images/Tools&Techniques/InsideOutCalipers/insideoutcalipers4web2.jpg)
These are brass and date from the first half of 20th-century.
![](../images/Tools&Techniques/Dividers/insideoutcalipersOLD4web.jpg)
In the John Wyke of Liverpool tool catalog, from the third quarter of
the 18th century, these are listed as being made of steel. He offered
several sizes.
![](../images/Tools&Techniques/Dividers/sectionofforestock_web.jpg)
Cross section of a rifle forestock. The calipers could be used to
quickly measure from the bottom flat to the outside of the stock.
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