Looking at the fine print further in Elgoods references I see he mentions a image of the flash pan in "A Glossary of the Construction, Decoration and Use of Arms and Armor in All Countries and in all times" by George Cameron Stone as figure 564.
But although he references it with regards to Sangster's design from Agra, I think it is the improved "automatic" design from Mysore.
(image of fig.564 from stones included for academic interest only)
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