Craftspeople from Naval History & Heritage Command Detachment Boston apply industrial grade tallow (i.e. fancy beef fat) to the skids where the haul blocks will slide. The blocks must be correctly positioned to support the weight of USS Constitution in dry dock.
The tallow, which is not for human consumption, will help the haul blocks slide smoothly into place.
The cross section below shows USS Constitution in Dry Dock 1 with the haul blocks in place. Note that in this plan the haul blocks have been slid down the skids to support the ship’s lower hull .
– M. M. Desy & K. Monea
USS Constitution Museum