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7 results for: efficient

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A regenerative x-ray tube, which by two lightbulbs, allowed a more efficient vacuum to be created
ARP23A15_432

A regenerative x-ray tube, which by two lightbulbs...

A regenerative x-ray tube, which by two lightbulbs, allowed a more efficient vacuum to be created
ARP23A15_431

A regenerative x-ray tube, which by two lightbulbs...

President Cleveland handing a paper to Henry Pearson
ARP18A17_089

President Cleveland handing a paper to Henry Pears...

World War II - Kodak advertisement
ARP15A07_266

World War II - Kodak advertisement

Hand-powered threshing machine
ARP09A00_310

Hand-powered threshing machine

Ventilating a mine
ARP07111_009615P

Ventilating a mine

Two horizontal water wheels, the left with highly curved blades more efficient than flat blades on right
ARP07102_460000154

Two horizontal water wheels, the left with highly ...