This month it's the Marking Gauge!
This particular gauge is made by American company Glenn-Drake Toolworks. Made from steel and brass, it's very different from the more commonly used wooden marking gauges.
One of the main advantages of this design is that it has a micrometer type adjuster this allows you to dial in adjustments exceedingly precisely, which also means settings can be easily repeated.
In the above photograph morticing discs have been fitted, these are set to the width of the mortise chisel then the grub screws are tightened. The fence can then be set and the mortice marked out.
Thats all for July, look out for next month's blog post!