Adams also studied terrestrial magnetism, determined the Gaussian magnetic constants at every point on the Earth and produced maps with contour lines of equal magnetic variation which were published after his death. He also gave tables of the positions of the moons of Jupiter, spent much time on a catalogue of Newton's papers, and calculated Euler's constant to 236 decimal places. In all he wrote about 50 papers, of which eleven were on pure mathematics, but it was his passion for perfection which prevented him publishing much more.