Black drop effect during the 1769 Transit of Venus Size:L: 100 x 50cm Watermarked 'Tacey Wisd & Co

Watermarked 'Tacey Wisd & Co 1819'

11th October 1964

4th September 1980

the feathers round the beak

Black drop effect during the 1769 Transit of Venus Size:L: 100 x 50cm Watermarked 'Tacey Wisd & CoViews of the teardrop effect observed during transit as Venus is near the solar edge. Four figures of the event seen by Hirst using a 2 foot long reflecting telescope to x55 magnification. Inscribed in ink above 'XI p. 229'. Not signed. The illustration corresponds to figures 5 8 on plate 10 and 11 of the published paper 'Account of several phaenomena observed during the Ingress of Venus into the solar disc' by William Hirst, Philosophical