Test of the equivalence principle using a rotating torsion balance

We used a continuously rotating torsion balance instrument to measure the acceleration difference of beryllium and titanium test bodies towards sources at a variety of distances. Our result Delta a(N,Be-Ti)=(0.6 +/- 3.1) x 10(-15) m/s(2) improves limits on equivalence-principle violations with ranges from 1 m to infinity by an order of magnitude. The Eotvos parameter is eta(Earth,Be-Ti)=(0.3 +/- 1.8) x 10(-13). By analyzing our data for accelerations towards the center of the Milky Way we find equal attractions of Be and Ti towards galactic dark matter, yielding eta(DM,Be-Ti)=(-4 +/- 7) x 10(-5). Space-fixed differential accelerations in any direction are limited to less than 8.8 x 10(-15) m/s(2) with 95% confidence.