On 5/14/2018 12:10 PM, Bill Webber wrote:

> What is the biggest try square you have ever seen? 


 That is quite the interesting question, and I would guess the answer depends on
the definition of a try square.


From Wikip****A:

> A try square is a woodworking or a metalworking tool used for marking and
measuring a piece
> of wood. The square refers to the tool's primary use of measuring the accuracy
of a right angle
> (90 degrees); to try a surface is to check its straightness or correspondence
to an adjoining surface.


This in itself is a bit odd, in that it refers to woodworking and metalworking,
then restricts use to wood. Other definitions are simpler, such as google
dictionary:


> an implement used to check and mark right angles in construction work


 Looking at several other sources does not clarify things, so I will give three
answers, restricting to hand tools.


I have seen framing (rafter) squares as large as 48", with a 36" leg. This
roughly meets the above definitions, but is likely not in the spirit of the
question, as these squares are more general purpose and are not restricted to
right angles.


The largest square I have seen/used that is solely for square is a 36" blade and
30" leg. It is a Brown and Sharpe (IIRC) machinist's style try square. Quite the
heavy tool. Roughly 15Kg.


In a more historical, intended for woodworking vein, the largest I have seen or
used is (IIRC) an 18" blade with a brass bound leg. I do not recall the maker.
Used a few times in doing heavy timbers for historical reconstruction.


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