Show The Pressure of Light M. M Lebedew of Moscow has experimentally tally demonstrated that the pressure of light agrees with the theoretical determinations determinations deter deter- of Clerk Maxwell Maxwells Maxwell's theory declares that the combined effects of ot the electrostatic and tensions tensions ten ten- give e as a resultant a pressure r s I in the direction tf or eor of t the propagation r i of the wave a e of He announced an electric Y dl lamp that tP the falling concentrated c on tr a metallic t rays f disk delicately suspended in a vacuum ml might ht produce an appreciable mechanical effect The r radiometer of Crookes is a device dePice which arose from front this suggestion though its motion Is chiefly due to heat M. M Lebedew has eliminated the effect of heat and measured the effect of the light from an arc ac lamp and finds In this very within delicate l ri 10 o per cent e of hl Maxwells Maxwell's results e h that theoretical rt agree amounts They show that the pressure is directly to the energy of the light and nd entirely independent of its color N. N Y Sun |