Horizontal intensity variometers.
| Other author | Hartnell, George. |
| Other author | U.S. Coast and Geodetic Survey. |
| Format | Microform |
| Publication Info | [Washington?] : U.S. G.P.O., 1922. |
| Description | 62 pages : illustrations ; cm. |
| Subjects |
| Series | Coast and Geodetic Survey Serial No. 212 Coast and Geodetic Survey Spec. Pub. No. 89 |
| General note | Reuse of record except for individual research requires license from LexisNexis Academic & Library Solutions. |
| General note | [On theory, fundamental equations, and characteristics of instruments used at magnetic observatories] |
| Citation/References note | CIS Index to U.S. Executive Branch Documents, 1910-1932 Part 2 |
| Reproduction note | Joyner- Microfiche. [Bethesda, Md.]: LexisNexis Academic & Library Solutions, 1997. 11 x 15 cm. (CIS US Executive Branch Documents : no. C4.19-89) |
| Other title | Terrestrial magnetism: Horizontal intensity variometers. |
| Govt. docs number | C 4.19:89 |