1925 photo purporting to show the testing of Harry Grindell-Matthews’ death ray weapon on Flat Holm

Peter Sampson, the current Chair of the Flat Holm Society, will talk about the extraordinary trials of Edmund Zalinski‘s Pneumatic Dynamite Gun in the 1890s and the role of innocuous looking Dale Fort in World War Two.

And did you know our very own Flat Holm was used in the 1920s to test a death ray?

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