Graphical Construction Glossary >> Tools. >> Hand Tools >> Mortise Gauge
Used for marking any parallel lines, and in particular of course mortises.
Most of these mortise gauges have a single gauge point on the opposite side of the beam, but don't make the mistake of thinking this one tool will do the job of a marking gauge as well. It will but a separate marking gauge is essential. Invariably you will have the mortise one set up and not want to disturb the setting.
The gauge above is identical to the one that I bought as an apprentice joiner in the late 1950's, (as far as memory goes ;-). Some types have a knurled brass thumbscrew instead of the old slotted screw head seen here to lock the gauge. The screw head means that a screwdriver has to be found to adjust it, the screw slots get worn and because they had a large slot it meant that a large screwdriver was needed. This quite often lead to over tightening and damage to the gauge itself.
Rosewood was the wood of choice for quality tools and beech was used for cheaper ones.
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