Shelter construction and method of assembling same
 A shelter construction includes a series of upstanding posts secured to the ground, and a group of tensile lines interconnecting the upper portions of the posts for supporting a thin flexible sheet of imperforate material overlying the group of tensile lines. The sheet is attached to the tensile lines, and the periphery of the sheet is fixed to the ground. The posts are arranged in a plurality of concentric imaginary rings, and they are of different heights with groups of the posts of substantially the same height being arranged along the same rings and being arranged with posts of progressively shorter heights along the rings with progressively increasing radii to enable the shelter to assume a dome shape. In order to facilitate the assembling of the shelter, a protracting tool having a circular face plate graduated in equally angularly spaced markings about the periphery thereof is positioned at the desired center location of the shelter so that a measuring tape having graduated markings thereon can be attached with its end to the center of the face plate. The tape is then positioned over successive ones of the angularly spaced markings so that the posts may be positioned opposite predetermined ones of the markings on the tape with one of the posts being disposed at the center location. 
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inventional additional inventional inventional inventional
William H.
Small