Studies of H_{2}O Sources by Means of a Very-Long Interferometer

Observations of the 1120 sources associated with the objects W3 (OH position), Orion Nebula, W49, and `ry Canis Majoris with coherent interferometers of baseline lengths 1.7 x lO and 5.0 X 1O wavelengths have been made. None of the sources have been resolved at the limit of our resolution of about O'.003 of arc. The angular separation of two features in W49 is found to be 0'.'7.