In the bibliography compilated by Margaret A. Compton, there is a reference from 1937:  Smethurst, Philip C. Exposing Cine Film: Exposure Difficulties Solved. London: Link House Publications,  1937. 82 pp., diags.

I have a volume impressed on July, 1936, 80 pp. (size 12,36 x 18 cm - 7.0 x 4.84 in.)

Next you can see  the cover y some advertising from its Guide to Cine Equipment (natural size)










References


Small-Gauge and Amateur Film Bibliography
Edited by Margaret A. Compton.
Compiled by Margaret A. Compton, Katie Trainor, Karan Sheldon,
Dwight Swanson, and William O’Farrell (.pdf)

Small Gauge / Amateur Film Bibliography
The Small Gauge and Amateur Film Bibliography, compiled by Margaret A. Compton, Katie Trainor, Karan Sheldon, Dwight Swanson, and William O’Farrell with the help of other small gauge luminaries, is a project launched in 2000 by the Small Gauge Task Force. Intended as a growing document, it was last revised in 2005 by editor Margie Compton. The entire document may be downloaded for printing, Small Gauge and Amateur Film Bibliography, 2005 (.pdf)
AMIA (the association of moving image archivists)