Systematic Errors in Sciences: A Review of Rejection of Sir William Crookes’ Papers on Psychic Force

Abstract

A review was conducted of Crookes' lever experiments on the psychic force proposed by Daniel D. Home. The levers were 36"-long boards with a fulcrum at 1.5" and 4.5" from the left end in the first and second experiments, respectively, and had a spring-balance suspension at the right end. In the first experiment, Crookes did not provide sufficient evidence to conclude that the experimental results could not be explained using Newtonian mechanics. In the second experiment, direct contact between Home's hand and the lever was prevented by a water vessel that had been set exactly over the fulcrum. If the gravity center of the vessel is assumed to have been off-center by even 5 mm to the right of the fulcrum, a force greater than 114 lbf would have been required to be exerted on the lever when Home's fingertips were dipped in the water to produce the observed increase in spring force (0.71 lbf); this is physically impossible. The analyses show that neither changes in the buoyant force on the dipped fingers nor water sloshing or external tremors can explain the experimental results. Additionally, some well-known paranormal phenomena are listed for a possible future extension of this study.