In 1959, with support from Marshall of Cambridge Ltd. (later Marshall Aerospace) a 5 kW forty-cell battery, with an operating efficiency of 60%, was demonstrated publicly.
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Sankey diagrams are named after Irish Captain Matthew Henry Phineas Riall Sankey, who used this type of diagram in 1898 in a classic figure (see panel on right) showing the energy efficiency of a steam engine.
Addition of Iron sulfate to the subarctic western Pacific gyre caused increases in primary production rates, chlorophyll a concentrations, biomass, and photosynthetic energy conversion efficiency.