Long Baseline Interferometer, Observations at 408 and 448 MHz--I: The Observations

Ten series of long baseline interferometer observations have been made at 408 and 448 MHz. The measurements were made between pairs of stations selected from four observatories in Canada and one in England. The longest baseline used was 6833 km $$(9.3 \times 10^{6} \,\text{wavelengths}).$$ Measured fringe visibilities are given for 33 radio sources. Details are also given of observations of a further 28 sources for which no fringes were detected.