الفهرس 
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Abstract
Thin shell construction-as understood today-did not become a practical concept until 1924 when Karl Zeiss applied Love’s theories to the design of a small semi-elliptical shell roof for the Zeiss work-- at Jena. Since then there have been rapid developments both in the analysis, design, and construction of thin shells.
Most attension was, however, given to singly:-, curved shells.
Doubly curved surfaces such as hyperbolic paraboloids known to mathematicians for centuries as a geometric shape were not considered a structural possibility untill 1933 when the French engineer Aimond put for¬ward the idea of employing these shapes in the construc¬tion of wide span buildings like aircraft hangars. in 1934 another French engineer, Lafaille, demonstrated the great structural potential of hyperbolic paraboloid shapes by designing a thin shell structure consisting of four such ruled surface shells supported on a ce,itral folded plate frame.