Measurements of the directly transmitted ultraviolet solar flux in 2-¿ intervals in the range 2981-4000 ¿ had been obtained at Boulder, Colorado, over a period of 2 years. A spectrum if the extraterrestrial solar flux has been derived from these data by use of a modified Langley method. This spectrum is compared with several spectra measured by other investigators, and differences are discussed. The measurements are also used to obtain total ozone and dust extinction as a function of wavelength. The ozone results are compared with total ozone measured concurrently by the Dobson spectrometer.