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absorption amplitude angle aperture Blake and Fountain Boltzmann mirrors ceivers cent center maximum centimeters collecting mirror comparison constant corresponding curve taken Dartmouth College dielectric dielectric constant distance distribution of energy diverging due to reflection energy reflected energy transmitted extra-transmission focus glass plate half wave-length horizontal incident energy interference curves lengths of resonators main receiver maxima and minima maxima or minima movable mirror multiple reflections nearly non-selective receivers optic axis ordinates parabolic mirror parallel beam phase change due Phys plate of glass plotted as abscissae point source position ratios readings were taken reflected beam reflected energy reflecting surface reflection coefficients refracted represent resonating length resonator screens Righi vibrator screens of resonators second maxima single screen standard condition thickness three screens tion tors transmitted and reflected true wave-length tuned receiver tuning curves University of Maine varied vibrator and receiver wave-length curves wave-length determination Webb and Woodman wire grid writers