For the purpose of obtaining a direct gravity‐connection between Ottawa and European base‐stations the Dominion Observatory made, during the summer of 1928, relative determinations of gravity at Ottawa, Greenwich, and Potsdam. Ottawa is the base for some 100 field stations in different parts of Canada. Greenwich is a recognized base‐station for gravity‐work in Great Britain, India, and the Dominions. Potsdam is the base to which gravity‐stations in all countries throughout the world are referred. Potsdam is also one of the limited number (possibly two) of places at which a strictly accurate absolute determination of gravity has been made. In addition to making possible a comparison between Canadian gravity‐stations and other gravity‐determinations throughout the world the work is of interest at the present time in view of its bearing on the question of the reality of the longitude‐term in the formula for gravity. The value of the comparisons was increased by a connection that was made early this year between Ottawa and Washington. Potsdam, Greenwich, Ottawa, and Washington are therefore linked together by t