On the Interpretation of Measured Solar Wave-Lengths

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Abstract
Reasons are given for expecting that collisions with H and He atoms produce a shift of most Fraunhofer lines to the violet rather than to the red. When allowance is made for this effect, and for the many uncertainties in collisional broadening theory, the interferometric measures of solar wave-lengths seem consistent with a complete absence of systematic Doppler shifts on the solar surface.