Percy F. Westerman, The Sea Scouts of the Kestrel (1925)
“ The spinnaker, a large triangular sail of light canvas, was spread by being hoisted by a halliard to the mainmast head, the tack being secured to the mast below the gooseneck, while the third corner of the sail was hauled out to the extremity of a horizontal spar known as the spinnaker boom. The latter was held by means of a sheet, but in order to prevent any tendency on the part of the boom to swing back, it was secured on the free side of the sail by means of a rope called a “guy.” The duty of “manning the guy” was deputed to Fred Heavitree. ”
