PROJECT 10073 RECORD CARD — Alameda, California, 19 May 1955

On 19 May 1955, at 0315Z, a civilian witness named Dudley M. Stone, along with two other individuals, observed an unidentified object in the sky over Alameda, California. The object was described as round and silver, appearing to be the size of a pea held at arm's length. The witnesses observed the object for a duration of thirty minutes. During this time, the object remained stationary before eventually rising slowly and fading from view. The sighting occurred under conditions featuring scattered clouds and vapor trails. The report notes that there were two or three jets at a higher altitude and a couple of commercial planes at a lower altitude during the event. The official assessment of the sighting, recorded on a Project 10073 record card, concluded that the object possessed all the characteristics of a balloon. The length of the sighting was cited as evidence substantiating this conclusion, and the case was resolved as a probable balloon. The documentation indicates that no further investigation was authorized regarding this incident.