Over the past couple of days I have been doing some research on Knockraha and in particular the bomb factory and Sing Sing prison. The bomb factory seems to be a more interesting site as it is no longer visible. I visited the site on Saturday and there is no indication that there was ever anything there.

There are very few artifacts that still survive. The trough was half full of sand and the casting would have fallen into it and left to cool. 

This is the only drawing that exists of any of the equipment that was in the bomb factory.