Hockley (Frederick) Mr Yardley's Process

Hockley (Frederick) Mr Yardley's Process

Saturday, July 11, 2015

communicated by him to Mr Garden of London in 1716,
transcribed from an autograph letter of Dr. Sigismond Bacstrom in 1804
with a translation in French by Julien Champagne.

Presentation by Alain Marchiset. 2015