Tool guys: What is this?

[Peartree]

My grandfather was a German immigrant that repaired turbine generators in-situ. I have inherited many of his tools. Among them was this measuring instrument. It's a little like an adjustable square. It has one screw adjustment that loosens to dlide along the long axis or tightens to lock in place. The second screw, at right angles to the first, extends and retracts a small tab (only a half, to an inch of movement) along the flat plate that perpendicular to the main axis.




Any idea what it is?

 

[stealth6]

Look up Starrett #289.
Not sure what the exact name of it is, but you attach a second steel rule (at a right angle) to a combination square

s6

 

[stealth6]

Here's a pic of one.....

s6

 

[Sandy H.]

[edit]

Basically what he said, but I didn't go so far as to get an example, so stealth6 for the win!

[/edit]

Based on the screw and knurled nut shapes, it is far from young, which I prefer in my tooling. . .

 

[Peartree]

Awesome! Thanks folks. That makes a lot of sense and I have another of my grandfather's Starret steel rules that might well have belonged with this one.

Based on the screw and knurled nut shapes, it is far from young, which I prefer in my tooling. . .

No this is certainly not young. My grandfather fought for the Kaiser in WW1 before immigrating to the U.S., and retired from Westinghouse in the 1960's (or earlier).

 

[MALBAR 70]

I have a few of these in different sizes.
My Dad worked at the LS Starrett Co for many years, he managed to "acquire" many cool things.