Main Topsail Yard: Shows the blocks that are stropped over the topsail yard, tie blocks, quarter blocks, leech line blocks, boom irons, and the lift blocks.

• 主上桅帆桁：显示了环绕在上桅帆桁上的滑轮、系滑轮、转角滑轮、帆端上拉索滑轮、吊杆、，和升降滑轮。