Tachometers for airplane engines
By: Prepared in the Office of the Director of Air Service.  July, 1919.
Contributors: United States. Adjutant-General's Office.
Publisher: Govt. Print. Off.
Published: 1919
Place of publication: Washington
Language: eng
Number of pages: 12
Subjects: Tachometer
Notes: On verso of t.p.:  War Dept. Document no. 916.  Office of the Adjutant General.
"References:" p. 12.