San Francisco : Architect and Engineer, Inc · leaf 395
grips on the sash andforce of increasing magnitude was applied untilthe sash began to move. The force was thenreduced so that the sash continued to move with uniform velocity. The force necessary to startthe sash and that necessary to continue it inuniform motion after starting were both re-corded.… … ■Sosh Defo// A Defot/A Defo///i De/o//A
Architecture · Building
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