Ratier Metal Propeller with Pitch Variable in Flight (1930)
NASA Technical Reports Server (NTRS) · leaf 11
N.A.C.A. Technical Memorandum No.559 Fig.6 … grooves; 33, thrust bearing absorbing the reaction of the jack 31; 34, small toothed wheel keyed to shaft 38; 35, large transmission gear driven by 34 and in turn actuating the two small control wheels of the other two jaoks not shown in the cut; 36, cover of the fixed casing; 27, felt packing…
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.