What engine ?

[R]

Lewis project  (ex-Adelaide)
Said to be 1910
What engine is that

https://scontent.fbne6-1.fna.fbcdn.net/v/t39.30808-6/656653990_936403695650586_909555156376747768_n.jpg?stp=cp6_dst-jpg_tt6&_nc_cat=106&ccb=1-7&_nc_sid=e06c5d&_nc_ohc=1Byd0ztidSIQ7kNvwHLz3eK&_nc_oc=Adr2QXIju4D6UVj1SdEDGn8PkC5lOydZKbZmxiQMrhTum3_fh1n4is6iboMt0Deo-uI&_nc_zt=23&_nc_ht=scontent.fbne6-1.fna&_nc_gid=9V5lj1zNrTJq0sz6APrccg&_nc_ss=7a30f&oh=00_AfxhHqDjdEoBu-rsT0HRi3oNRBueq8leAUHIJwoPIOJhSg&oe=69C9629C

Have some vague recollection of this - with those twin bolts in the exhaust stub like that.
AJS  ??