THE Pratt & Whitney Co. has recently brought out a new engine—the Series H. Wasp. It embodies the principal features of previous engines of this type, but also incorporates certain new ideas. One of the most important novelties introduced is automatic valve lubrication.
(1935), "A New Pratt & Whitney Engine: The 550 Horse‐Power Single Row Nine‐Cylinder H. Wasp Described and Illustrated", Aircraft Engineering and Aerospace Technology, Vol. 7 No. 3, pp. 70-72. https://doi.org/10.1108/eb029914
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