megalographn.
/ˈmɛɡələ(ʊ)ɡrɑːf/, /ˈmɛɡələ(ʊ)ɡraf/, /ˈmɛɡl̩ə(ʊ)ɡrɑːf/, /ˈmɛɡl̩ə(ʊ)ɡraf/, U.S. /ˈmɛɡ(ə)loʊˌɡræf/, /ˈmɛɡ(ə)ləˌɡræf/ Now historical.
A kind of camera lucida capable of producing traceable images of objects seen under a microscope and patterns produced by a kaleidoscope, formerly used in industrial pattern-drawing.
ΚΠ
1876 Sci. Amer. 25 345/2 In this exhibit is an admirably designed camera lucida, or, as it is here called, megalographe... It differs from the ordinary camera lucida, inasmuch as it admits of drawing directly from the objects under the microscope.
a1884 E. H. Knight Pract. Dict. Mech. Suppl. 592/1 Megalographe, a French name for a form of camera-lucida, made by Secretan, of Paris.]
1890 Cent. Dict. Megalograph.
This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022).
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n.1890