Alvan Macauley and group of men watching dynamometer test of Packard 905 engine
Description:
View of Alvan Macauley and group of men watching dynamometer testing of Packard 905 aircraft engine. Handwritten on back: "Neg. no. 23A. Date: 12-28-16. Main guide: Mr. Macauley with group. Remarks: Dyn test of engine 905. Liberty motor design based on this Packard-developed airplane motor."