A New Method of Utilising Models or Apparatus for Comparing the Relative Volumes of Geometrical Solids.

摘要

22,006. Crookes, S. I. Oct. 13. Educational appliances; geometry, teaching.- Models of bodies of various forms, such as prisms, pyramids, &c., are made hollow, of sheet metal or other material, so that they may be filled with sand or liquid &c., and used in classes for demonstrating the relative volumes and the correctness of formulae or calculations relating to the volumes of the bodies.