Sinusoidal Ruler
thingiverse
I recently had to sketch numerous sinusoidal waveforms for my last exams. Drawing them freehand can be extremely time-consuming and lacks precision, which is why I came up with this simple ruler. The two dots are positioned at 120 and 240 degrees from the beginning of the waveform. This makes it effortless to draw a three-phase sinusoidal waveform as well.
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