The elements of the heliograph.
By: Prepared under the direction of Brig. & Bvt. Maj. Gen'l W.B. Hazen ... by Frederick K. Ward ...
Series: [United States. Army. Signal Corps] Signal service notes,; no. 11
Publisher: Signal Office
Published: 1883
Place of publication: Washington City
Language: eng
Number of pages: 12
Subjects: Heliograph.
Notes: At head of title: Signal Office, War Dept.