. Model of a double capstan in a wooden frame that represents two decks. Both capstanes are for twelve wind trees and have six choose. The lower drum has eight catches in the foot to prevent decrease. The drums can be used in four ways: blocked, separately, coupled, and combined so that the topmost drives the lower delay. The combinations are obtained with pells in the foot of the lower drum, with which the radilia consisting of sun-and-planetraders, placed under the bottom of the beams, can be put into operation, and by linking or disconnecting the kings of both Drums with a mechanism on the head of the lower capstan, which is now incomplete. Scale 1:10 (estimation).