The Thomas Crapper reference can be found in published sources, but they cite no sources. It appears to be a myth perpetrated by Flushed with Pride: The Short of Thomas Crapper, (1969) by Wallace Reyburn. Panati (who I cited above) writes: The book reads for long stretches as serious biography, but the accumulation of toilet humor puns, double entendres, and astonishing coincidences eventually reveals Wallace Reyburn's hoax." [examples omitted]