coal

Vienna, July 1939 (Schauberger Archives) (The Energy Evolution, page 93-94)

In 1933 a proposal was presented to the Alpine-Montan company stating that the ore from iron ore deposits could be delivered to Donawitz, not at the current price of about 3.50 schillings per tonne by rail, but at a cost of about 0.30 schillings per tonne by means of a patented double-spiral-flow pipe (see fig. 16⁵).

At first this proposal was ridiculed, because according to expert opinion either the ore, having a specific weight of 1.9 and therefore heavier than water (= 1.0), would be left lying on the bottom or the pipe-walls would be heavily scoured within a short space of time, and therefore the proposal would not be commercially viable.