
[HM] "portagraion"  a "mathematical instrument" circa 1745?
Posted:
Feb 6, 2006 5:35 PM


The following question was posted on another list. I will forward all replies posted to HM or sent directly to me.
 James A. Landau
>Date: Sun, 5 Feb 2006 13:20:23 0500 >From: "Joel S. Berson" <Berson@ATT.NET> >Subject: Q: "portagraion"  a "mathematical instrument" circa 1745? > >What is a "portagraion", in the following quotation from 1745? I've >done my best in OED2 and googling with various possible >spellings. The mention just before of drawing pens suggests >"pantograph", but that's not close to what I see. >Stephen Greenleaf, Mathematical InstrumentMaker...;Makes and mends >all Sorts of Mathematical Instruments, as Theodolites, Spirit Levels, >Semicircles, Circumferences, and Protractors, Horizontal and >Equinoctal [sic] Sun Dials, Asimuth and Amplitude Compasses, >Elliptical and Triangular Compasses, and all Sorts of common >Compasses, drawing Pens and Portagraions...; with sundry other >Articles too tedious to mention.

