Two triangular prisms mounted with string and sealing wax on a pinewood baseboard.

They come from a 15-drawer cabinet found in the Herschel family home in the 1950s. The contents of this and a similar cabinet seem to suggest that they were used by successive generations of the family to store specimens, material and apparatus for carrying out experiments. This object was presumably assembled to carry out a particular experiment though it is unclear precisely what that might have been.