Prismatic Press House

In the 1880s it was found that pressing gunpowder into small sized prisms was more efficient. This powder was called prismatic powder and was used in heavy guns.

Little remains of the prismatic press house today, but it might have housed a prismatic powder machine such as this:

A cam-press for making prismatic powder. This press was built by the Grunsonwerk of Buckau, Germany. Click on the image to enlarge. Public domain image.

The prismatic shape is illustrated by the Chilworth Gunpowder Company Cricket Club logo.