projectioningn.
Apparently a compositorial error for projecting n. Four earlier printings of Moxon's Mechanick Dyalling (published between 1668 and 1698) read projecting in this passage.
ΚΠ
1703 Moxon's Mech. Dyalling (ed. 4) in Moxon's Mech. Exercises (new ed.) 347 I have taught you in the projectioning the Horizontal Dyal the original way of doing this.
This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2018).
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n.1703