David Rittenhouse 17321796, American astronomer and inventor. He introduced spiders web as crosshairs in telescopes and measuring instruments. He discovered the atmosphere of the planet Venus. Engraving 1896. Editorial Stock Photo - Afloimages
David Rittenhouse (1732-1796), American astronomer and inventor. He introduced spider's web as cross-hairs in telescopes and measuring instruments. He discovered the atmosphere of the planet Venus. Engraving 1896.