Hartmann’s Practika is a collection of writings by the 16th century instrument maker Georg Hartmann. These detail the steps to design a range of sundials, and extensive notes on astrolabe construction. Hartmann begins by demonstrating the geometrical construction techniques he will be using. Given how complex some of the design work will be, this seems […]
The first step has to be making myself a protractor. I was going to create one as a proof of concept then switch to a commercial model, but I have changed my mind. If I can make a reasonably accurate tool, I can laminate it and use it; getting rid of the need to ‘cheat’. […]
Allowed tools: Straight-edge: NOT a ruler, I need to find a nice (straight!) length of hardwood with no markings. I may cheat and use a steel yardstick. Compass: I have a nice Staedtler compass, but it will not be big enough for some of the arcs required. I may add a beam compass or experiment […]
During my vacation, I spent a few hours one afternoon with a straight-edge, a compass, and my copy of Stoeffler’s Elucidatio – The Construction and Use of the Astrolabe. I was able to draw out a basic climate plate very easily; in fact I was surprised at how straight-forward it was. I am inspired to […]