San Francisco : Architect and Engineer, Inc · leaf 52
and two in Italy. The pre-stressed spiral beam rises 13feet between the ground and first floor,and 12 feet between the first and secondfloors. The weight of the stairway, includ-ing treads, is about eight tons. Treads are to cantilever out from eachside of the beam and are 5 feet 6 incheswide.… … Especially convenient for use on anytable or desk: may be stored in minimumof space when not in use: easily dis-assembled for carrying; rubber tipped legsprotect table and desk tops. Locks at anyangle and will swivel or tilt to any de-sired position. Made of hand-polishedprecision aluminum. Screws…
Architecture · Building
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