![Pub[lication] - Defense Mapping Agency](gimbir/book.png "Pub[lication] - Defense Mapping Agency")
Pub[lication] - Defense Mapping Agency
... to observe the indication of the eartha#39;s rotation during the short period in which his manually operated gyroscope remained in rotation. ... Elmer A. Sperry, an American, and Anschutz-Kampfe, a German, independently invented gyrocompasses during the first decade of the 20th century. ... Sperrya#39;s compass was found adequate, and in the years following World War 1 gyrocompasses became standardanbsp;...
| Title | : | Pub[lication] - Defense Mapping Agency |
| Author | : | United States. Defense Mapping Agency. Hydrographic/Topographic Center |
| Publisher | : | - 1977 |
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