Farman F.121 interior photo from NACA Aircraft Circular No.15
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
1926-09-01
<a rel="nofollow" class="external free" href="https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930089068.pdf">https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930089068.pdf</a>