CONTENTS 



CKAP. PAGE 



I HOW LIGHT EXERTS PRESSURE ... 9 



II EXPERIMENTS ON THE PRESSURE OF LIGHT 



FALLING PERPENDICULARLY ON A SURFACE 34 



III EXPERIMENTS ON THE PRESSURE OF LIGHT 



AGAINST THE SOURCE FROM WHICH IT 

 ISSUES. THE RECOIL FROM LIGHT . 44 



IV EXPERIMENTS ILLUSTRATING THE CARRIAGE 



OF MOMENTUM BY A BEAM OF LIGHT . 52 



V THE PRESSURE OF LIGHT IN ASTRONOMY. 



SOME POSSIBLE CONSEQUENCES . . 69 



NOTE 



I LIGHT-PRESSURE ON THE CORPUSCULAR 



THEORY . . . -^3 



II THE PRESSURE DUE TO WAVES ISSUING 



NORMALLY FROM A SURFACE . . 84 



III THE PRESSURE OF A BEAM INCIDENT 

 NORMALLY ON A PERFECTLY REFLECTING 

 SURFACE 85 



vji 



