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Also known as the Pall Mall grenade, from the address of the inventor, George Alfred Smith. The ignition system used two glass bulbs, one containing concentrated sulphuric acid and the other a mixture of sugar and potassium chlorate - twisting the cap crushed the two bulbs, mixing the chemicals which ignited and set off a time fuze. (It was a similar igniter to the later WWII No.75 Hawkins grenade/mine, but which had zero delay.)
An image of another example of this experimental grenade with its top cap is shown (thanks to BOCN member Darrol). Impressed around the periphery of the cap top face were the words PALL MALL GRENADE and in the centre of the cap top face SMITH'S PATENT 13197-15.
Rough handling of a grenade containing adjacent frangible glass vials of reactive chemicals was deemed unwise and the Pall Mall grenade did not progress.
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