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# Blog Posts by Jim Tolpin

## Old-School Board Stretching Trick

In the process of building the sliding till for a tool chest (which was started by Chris Schwarz and will be auctioned off when I'm done with it…

## Fractions in a fraction of the time

Here’s a page from a forthcoming book I’m working on about the core geometric truths (first principles) that underlie–and led to the development of– all our layout tools,…

## Old School Framing Square Trick #1

One of the primary uses of the framing square is to create slope lines for calculating unknowns--not necessarily in all cases to high precision, but to get you…

## Sine Curves the Easy Way

To develop the curves in the various brackets--here the support for the back fence on the lid of a correspondence desk-- I followed the ancient practice of…

## Mark Marks the Spot

In the last post I showed you the layout marking tools that not only marked points and lines, but made physical indications of divots or lines in the…

## X Marks the Spot

To be precise, the "pointy sticks" X-1 through X-8 marks the spot. All these layout marking tools do the job, but all in a somewhat different way to…

After using the scale for a while, I decided to give it a few new features:  Paper-rivet lined hang-up holes and two index points for setting the dividers…

## Hands-on Teaching Tool

Here's a page from a forthcoming pamphlet I'm working on about the geometric truths that underlie--and led to the development of-- all our layout tools, including (basically end…