Whilst browsing through an old 1920 American Machinist magazine I spotted a design for a simple "One Hand Operated Depth Gauge". I could see straight away that this was a well-designed little piece of kit, which would fit in the hand nicely, and be easy to use. It could easily be made by someone new to the hobby with limited equipment, and it would be a worth wile addition to anyone's tool box, photo 1.The gauge was depicted by a very nice piece of graphic art in the magazine it's a pity that graphic art illustrations have been replaced by modern photography and 3D CAD, as I can really appreciate the artistry and skill involved, photo 2, fig. 1.
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