One of the most used pieces of equipment in our studio are parallel gliders. I think I am the only one who still uses a parallel bar but these little dealios are great for quick drawings and layouts by hand. The ones we use are made my Alvin but they come in a couple of models. The most common has a blue anodized roller bar. Mine has a silver anodized bar. There is also one model called a Rolling Parallel Ruler. I have the tiny 6" version of that to carry along but generally I think they track a little less true than the professional parallel glider.
This is what Alvin says aboutn them on their website: "An easy-to-use instrument that combines the functions of a parallel straightedge, triangle, protractor, T-square, and compass in one. One of the most useful and convenient aids for drafting, drawing, and nautical applications. Smooth gliding action to easily make parallel lines without twisting or turning under accidental pressure. Features durable acrylic blade with printed graduations, through-holes at ½" increments for drawing circles, and a comfortable aluminum roller bar with non-skid rubber O-rings for a firm grip on any surface. Available in both 10" and 14" lengths in metric and inch versions."
I've used the 6" plastic parallel ruler for several years to make quick sketches, etc. I ust got the 10" parallel glider with the silver anodized roller bar a few weeks ago, and I'm amazed by the quality and how easy it works. The plastic on the 6" ruler also doesn't hold up well with pencils going back and forth...mine is actually not straight any more. The 10" is acrylic and match better for more serious work. Then again, it's a good bit more expensive.
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