A device or instrument used to draw or record spiral or helical patterns.
From helix (spiral) + -graph (writing instrument or recording device). Combines Greek roots to create a term for tools that visualize helical motion or patterns.
Before computers, engineers used helicographs to design springs and screws with precision—the machine would mechanically trace perfect spirals that could be used as blueprints, making mass production of identical coils possible.
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