the tomb of Abibi, at Saqqara, of c. 2500 BC, showing men lowering
a typical bipod mast of the Old Kingdom.
in the tomb of Ipi, at Saqqara, of c. 2500 BC, A helmsman holds
both the braces to the upper yard and the tiller; a man below
controls the lower braces. Note the single forestay and numerous
backstays, and the crutch for lowering the mast.
From A History of Seafaring - edited by George F. Bass