I want to know the answer to the following question:
How many liters of water per minute did Shuman's engine pump in litres?
All the background I'm provided with is that "Although the outbreak of World War I and the discovery of cheap oil in the 1930s discouraged the advancement of solar energy, Shuman’s vision and basic design were resurrected in the 1970s with a new wave of interest in solar thermal energy.". Is that enough to answer the question?
Answer: no