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Figures (1)

Fig. 1
Fig. 1

Hindle sphere testing of three zones of a convex hyperboloid (f/12) using three surfaces of the same diameter: (a) with a 146-cm radius of radius of curvature views the second zone; and (b) with a 190-cm radius of curvature views the second zone; and (c) with a 247-cm radius of curvature views the inner zone. (The vertical scale is expanded for the sake of clarity.)

Equations (2)

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f 1 = a ( 1 e ) = R ( 1 e ) / R ( 1 e 2 ) = R / ( 1 + K ) f 2 = a ( 1 + e ) = R ( 1 + e ) / R ( 1 e 2 ) = R / ( 1 K )
R K f 1 f 2 f / 12 311.416 2.77476 116.82 467.8 f / 30 119.226 1.814 50.83 343.8

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