kentledge

noun

1. (countable, uncountable)Weights (often scrap or pig iron) used as permanent ballast on ships.
2. (countable, uncountable)A system of weights (usually concrete or cast-iron blocks) used for load-testing piled foundations.

   “A kentledge of scrap chairs was placed in the bottom booms of the girders at the south end to counterbalance the weight of the rail rolling track fixed under the north half, and to increase stability.”