Observations of Immersions and Emersions of Jupiter's First Satellite, Made at Funchal, in Madeira, with a Reflecting Telescope of 18 Inches Focus, Made by Mr. Short. The Time Was Found by Taking Equal Altitudes, with a Quadrant of 12 Inches Radius, Made by Mr. Bird, and with the Help of a Good Pendulum Clock Made in London. By the Late Thomas Heberden, M. D. F. R. S

Mr. Bird, Mr. Short, T. Heberden
1770 Philosophical Transactions of the Royal Society of London  
doi:10.1098/rstl.1770.0044 fatcat:wpajox23qbfpjahlo7ketip3oi