BSA two-stroke lever cocking rifle Patent (1913 )
With thanks to Peter from vintageairguns.co.uk for supplying this scan.
See also http://www.network54.com/Forum/670443/message/1286565548 for pics of the rifle.
BSA push barrel rifle Patent no. 1988 (1914)
With thanks for the patent details to Peter from vintageairguns.co.uk.
The article that follows, describing a prototype push-in barrel BSA (though not built exactly to the patent specs) is by Harvey from Airgun World, Vol 2, issue 5, December 1978, with photos by John Priest.
These pics apparently of the same gun. With thanks to John.
BSA Patent piston head securing washer (1929) (full patent)
Scans from Lakey of the original patent.
Thanks also to Peter from vintageairguns.co.uk for Dennis Commins's research on this patent, which appears after the scans of the original.
This was the final BSA pre-WW2 patent application and dealt with the problem of the usual screw securing the leather piston cupped seal being damaged or coming loose.