28976989.pdf

|  1. DATE | 2. LOCATION | 12. CONCLUSIONS  |
| --- | --- | --- |
|  4 Feb 58 | Ohio River, Indiana area | ☐ Was Balloon ☐ Probably Balloon ☐ Possibly Balloon  |
|  3. DATE-TIME GROUP Local GNT NA | 4. TYPE OF OBSERVATION ☑ Ground-Visual ☐ Ground-Radar ☐ Air-Visual ☐ Air-Intercept Radar | ☐ Was Aircraft ☐ Probably Aircraft ☐ Possibly Aircraft  |
|  5. PHOTOS ☐ Yes ☑ No Phys Spec. | 6. SOURCE Civilian (2) | ☐ Was Astronomical ☐ Probably Astronomical ☐ Possibly Astronomical  |
|  7. LENGTH OF OBSERVATION NA | 8. NUMBER OF OBJECTS one | 9. COURSE NA  |
|  10. BRIEF SUMMARY OF SIGHTING A rnd obj, …

Device Picked Up on Ohio River in Indiana

Comdr, 5th District, ASI
AFCIN-4E4
4 Feb 58

1. The device is a magnetometer for remote measurement of the strength of the earth's magnetic field. The sensing element being supported by a pendulum mounting shows that it measures the strength of the horizontal component of the earth's magnetic field.

2. It was probably carried to a high altitude by a balloon and then transmitted field strength measurements by telemetry to a ground station.

G. T. GREGORY
Capt, USAF
AFCIN-4E4

Pul in case there
The Above Item returned To
5th district OSI 5 Feb 58, alon…

The device is a magnetometer for remote measurement of the strength of the earth's magnetic field. The sensing element being supported by a pendulus mounting shows that it measures the strength of the horizontal component of the earth's magnetic field.

It was probably carried to a high altitude by a balloon and then transmitted field strength measurements by telemetry to a ground station.

White
4E2d