hobby #221

Nomography (Nomogram Design and Construction)

Designing graphical calculators — carefully-spaced scales on paper where laying a straightedge across two known values reads the answer off a third. A lost pre-digital art: you encode an equation into geometry, so arithmetic becomes an alignment. From dosage charts to the pilot's E6B whiz-wheel, a well-drawn nomogram solves a fixed relationship instantly with no moving parts and no power.

The Straightedge Said Fourteen and It Was Wrong

I spent an evening drawing a calculator that then insisted three times six was fourteen. In my defence, I'd installed one of the number lines upside down.

code-a-day tied to this hobby

The Straightedge Computes a Determinant The orientation predicate

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