helicographn.

/ˈhɛlɪkə(ʊ)ɡrɑːf/
/ˈhɛlɪkə(ʊ)ɡraf/Etymology: < helico-, combining form of Greek ἕλιξ helix n. + -graph comb. form.
1860–4 (Archit. Publ. Soc.) (at cited word) An instrument..for describing the volutes and scroll work found in Grecian architecture, and called the screw helicograph.
This entry has not yet been fully updated (first published 1898; most recently modified version published online March 2018).