1851 Great Exhibition: Official Catalogue: Class X.: James Miller (Junior)
From Graces Guide
361. MILLER, JAMES, jun., 30 Thomas Street, Woolwich — Inventor.
A radiator, an instrument for drawing lines to a point or centre, with a graduated arc, fitting the instrument for being used as a protractor.
[The manner of using this instrument is by placing the centre of the glass over a given point, and keeping one arm fixed, whilst drawing all the lines required by the inner edge of the other.—J. G.]
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