With Diane's and David's permission ….
I'm offering some things on e-bay that might interest followers of this Forum, particularly the I/C engine brigade. They are original handbooks for the Gnome & Le Rhone rotary aero engines made under licence during the First World War by W H Allen of Bedford. Some of them include general arrangement drawings of these amazing machines. Both the 80 h.p. Type R and the 110 h.p. Type J are covered.
E-bay item no. 22103746854 is 'Instructions for the Care, Maintenance and Erection of the 80 H.P. Le Rhone Engine.' This will give you links to the others.
Thanks, Bill.