note: The online version is free access and download.
Applied Physics Research www.ccsenet.org/apr Vol. 7, No. 4, August 2015 issue.
under Further Experiments Demonstrating the Effect of Light on Gravitation
Louis Rancourt, Philip J. Tattersall
1. Use a cardboard box at least 1.2 m by 1 m by 1 m.
2. Use a meter stick to hold 2 cylindrical lab masses, one at each end. ( they can be replaced by 2 similar objects)
3. Suspend the meter stick at mid point by 3 fine copper wires ( take them from an old extension cord)
4. Use a support for attaching the upper wires as on the figure.
5. Put a pointed cardboard under the front end of the ruler; place a ruler under without touching the pointer.
6. Place a glass plate in front of the box. ( do not use plastic because it makes static electricity easily and that will influence the results.
7. Before closing the box, put water vapour in the box; the vapour will eliminate any static charges.
8. Outside the box, use a smaller box to hide a lamp. Make sure it will not catch fire.
9. Let the pendulum rotate back and forth for one day. You can then light the lamp and watch the swinging movement slowly bring the mass towards the hidden lamp.
10. Close the current in the lamp and the mobile mass will return to its normal position.
N.B. If it is well constructed, the pendulum should be always moving a fraction of a degree because of earth motion.
Explanation: Gravity is a force going in all directions, vertically, horizontally and all angles. When light is activated, it blocks some of the force going horizontally towards the mass; the force coming from the other side is now bigger and it pushes the mass towards the lamp.
N.B. The box containing the lamp could be made of steel and the effect will be still visible; that demonstrates it is not air movement or heat that causes the motion because the motion starts when the lamp is activated and there is no time to heat inside the big box.
Inside the cardboard box, with support and torsion pendulum
Mass and pointer details
ruler under the pointer to see the movement
Lamp outside the box;