Adolf Cluss,
Popular Science Monthly
(1875)
“ In place of the mastic, which attains consistency, by the congelation of the melted mass, without application of pressure, this "merely compressed body, in which the molecules of bitumen and limestone are soldered together by heat and ramming," obviates all tendency toward brittleness, without in the least interfering with the advantages of perfect homogeneity or water-proof qualities. It stands to reason that the mastic, which, notwithstanding its mixture with grit, is more or less pitchy, would be surpassed in elasticity and pliability by a merely kneaded mass. ”
