ROTH Zygmunt - White Coal [1938] [cover by Alexander Roth].

Lviv [1938]. Main composition: Bookstore "Książka" A. Mazzucato. 15x21.5 cm, pp. 128, black and white illustrations in the text, soft cover. Good condition (small soiling and tears of the cover, uncut pages, small paper loss on the spine).

A publication on hydropower. The cover was designed by Alexander Roth. Chapter titles: Work, power, energy. White carbon. Thermal properties of water and coal. The sun, coal and water. Water as a source of thermal energy. About the mechanical energy of water. Water wheels. The problem of transmission of energy over a distance. "White coal" conquers the world. The issue of water power in Poland. Natural and artificial waterfalls. Water turbines. "White coal" does not yield easily to the will of man. The sea as a source of artificial waterfalls. Where the energy reserves of "white carbon" come from.