Quasi-Isotropic Sandwich Core.
OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C
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The patent describes a structural core consisting of a winding of fibrous filaments which are wound upon a jig, each filament being disposed upon the preceding one whereby the winding defines parallel rows of tetrahedrons, half of which point upwards, the other half downwards. Sandwiched, in spaced relation, between the windings of filaments are sheets of fiberglas cloth. The dimensions of the sheets are coextensive with the dimensions of the winding.
- Structural Engineering and Building Technology