What does "The scale is always heavily weighted" mean?
Even at the present day the air is charged with prejudice. If any man of standing at the present instant were to enter a London newspaper office and say that he had detected a medium in fraud, the matter would be seized upon eagerly and broadcast over the country; while if the same man proclaimed that he had beyond all question satisfied himself that the phenomena were true, it is doubtful if he would get a paragraph. The scale is always heavily weighted.
The History of Spiritualism By A.C Doyle
XI.THE RESEARCHES OF SIR WILLIAM CROOKES (1870-1874)