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|Material Type:||Government publication, National government publication|
|All Authors / Contributors:||
Winslow Upton; William Babcock Hazen; United States. War Department.
|Notes:||"Published by authority of the Secretary of War."|
|Description:||31 p., 3 pl. : ill. ; 29 cm.|
|Series Title:||Professional papers of the signal service, no. 5.|
|Other Titles:||Construction and maintenance of time-balls|
|Responsibility:||[by Winslow Upton] ; prepared under the direction of W.B. Hazen.|