Royal Society


Giving Some Account of the Present Undertakings, Studies, and Labours of the Ingenious, in Many Considerable Parts of the World. EXTRACT from Vol. LIII For the Year 1763 ... 1764.
1st Ed. Sm. 4to. pp.(173-194). 2 folding plates. Disbound, without stitching, pages detached, sl. stained and lightly browned. Article comprises XXXI. Rules and examples for limiting the cases in which the rays of refracted light may be reunited into a colourless pencil: In a letter from P. Murdoch, M.A. and F. R. S. to Robert Symmer.
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