Observations of the cosmic background radiation near 1146+111B,C.

We have searched for microwave background inhomogeneities near the gravitational lens candidate 1146+111B,C. An east-west strip of sky, 16 arcminutes long and centered on the point between the quasars, was observed with a 105" diameter beam at 3 mm wavelength. Our observations show only noise with an rms noise level of 0.0010 K. These observations set stringent limits on the properties of the lensing object if it is a cosmic string or if it is a cluster of galaxies.