"Mr. R. Potter new simple heliostat" - in "London and Edinburgh Philosophical Magazine and Journal of Science", p.6-8, Richard Taylor, 1833
Fig.1 (p. IX):
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Fig. 3 (p. IX):
"Mr. R. Potter new simple heliostat" - in "London and Edinburgh Philosophical Magazine and Journal of Science", p.6-8, Richard Taylor, 1833
Fig.1 (p. IX):
Fig. 2 (p. IX):
Fig. 3 (p. IX):