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Information relative to construction and maintenance of time-balls [electronic resource].

Corporate Author
United States. Army. Signal Corps
Published
[Washington] : GPO, 1881.
Physical Description
1 online resource (31+illus. pages), digital, PDF file
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Report Numbers
W 42.11/1:5
Subject(s)
Reproduction Note
Electronic reproduction. [Bethesda, Md.] : ProQuest, 2014. digital, PDF file. ProQuest U.S. Executive Branch Documents Mode of access: World Wide Web via ProQuest website.
View MARC record | catkey: 18650203