Cusp-shaped solar heating panel used for heating a swimming pool 04-1974 (6919917536) (cropped)
Credit:
Wikipedia
Caption:
Marjorie and Aden Meinel, 1974
Credit:
Wikipedia
Caption:
Walter meinel stands in front of a linear parabolic reflector, a prototype of the system that he proposes for large "solar farms"..., 04-1974 (7065996627)