DOW-UAP-D103: Project Blue Book Photo File on the Tremonton Film, the General Mills "Pillow Balloons", 1952

Source file: DOW-UAP-D103_Project-Blue-Book-Photo-File-Relating-to-Tremonton-Film-Utah-1952.pdf Originating agency: U.S. Air Force, Project Blue Book; photographs from General Mills Research Laboratories, Minneapolis Document type: Photo file: cover sheet, typed index card with a mounted photograph, and one large photographic print with annotations on the back Date: Undated; the materials relate to the 2 July 1952 sighting and to the pillow-balloon inquiry of December 1952 Classification: No classification markings visible; declassified under Authority NND 923007; released 2026 Page count: 5 VIRIN: 260918-D-D0360-1092 PURSUE Release: 6

Summary

This is the smallest of the Tremonton records in PURSUE Release 6, and the most visual. Its five pages are the photographic part of the Blue Book case on the film that Chief Photographer Delbert C. Newhouse, U.S. Navy, shot beside a highway north of Tremonton, Utah, on 2 July 1952. The main case file, DOW-UAP-D102, records at p. 112 that the case included one 7 1/2 by 11 inch photo and one 2 1/4 by 2 1/4 inch photo. These appear to be the two photographs preserved here.

Both photographs show pillow balloons, the square, pillow-shaped balloons that General Mills, Inc., described in the case file as the only known manufacturer, had produced in quantity for the "Crusade for Freedom" (DOW-UAP-D102, pp. 26-27). They document one of the two explanations the Air Force weighed for the Tremonton objects. The only typed text is an index card that summarizes the sighting in eight lines and ends with the possible explanation: "Pillow balloons or Birds."

Research Article

What the five pages contain

Page 1 is a typed cover sheet: "Files 1377 & 1415," a date, "Tremonton, Utah" and "2 photos." The date reads "July 7, 1952," with the last digit typed over, which does not match the incident date of 2 July. The file does not explain the difference; it may reflect a misreading of the numeric date "7/2/52" used on the Blue Book labels. Page 2 is a typed index card with a small photograph mounted in its lower right corner; page 3 is the blank back of that card, marked "1377." Page 4 is a large print labelled "Fig. 6," and page 5 is its back, carrying the General Mills stamp and a handwritten note. There is no letter, memorandum or signature anywhere in the file.

The index card: "Pillow balloons or Birds"

The card condenses the case into a few lines: "CPO Delbert C. Newhouse," "7 miles north of Tremonton, Utah," "1110 MST 2 July 1952," "Driving on highway -- Wife noticed objects," and "Group of objects milling about in rough formation" (p. 2). Two lines state the limits of the evidence: "No reference points by which to estimate speed, distance or size" and "Size too small on photo to show detail." The last line reads "Explanation -- Pillow balloons or Birds." The first word of that line is typed over and cannot be read with certainty; it appears to be "Prob." or "Poss." Someone later circled "Pillow balloons" by hand and drew a question mark beneath it. The card is unsigned and undated; its wording follows Newhouse's own statement of 11 August 1952 (DOW-UAP-D102, pp. 70 and 113).

The small mounted photograph shows a loose cluster of pillow balloons seen from below against broken cloud. It is captioned in hand "PILLOW BALLOONS." The balloons appear as dark, irregular shapes, not as points of light.

The General Mills photograph

The large print on page 4 is the most striking image in the file. Three men in overcoats and hats walk across a snow-covered field while a large cluster of translucent, square balloons rises in front of them against a clear sky. The print is labelled "Fig. 6" in the margin, which suggests it came from a numbered set of illustrations; the rest of that set is not in the file.

The back (p. 5) is stamped "General Mills Research Laboratories, 2010 E. Hennepin Ave., Minneapolis 13, Minn.," with photo laboratory number 759 and a blank date line. Someone added a note in blue ink: "These are 'pillow balloons' 2' x 2'." The note continues that at altitude and against a cloud or adverse background, "these could give a 'saucer' appearance when laying in a flat, horizontal position." Beneath it are several small sketches of flat, pillow-like shapes seen at different angles. The note is unsigned and undated.

The context: the December 1952 balloon review

The photographs make sense only alongside the main case file. DOW-UAP-D102 records that on 15 December 1952 Lt A. G. Flues of ATIC phoned a Navy officer at the University of Minnesota who thought the Tremonton objects were pillow balloons, and that General Mills was named as the sole known manufacturer (D102, pp. 26-27). On 30 December the film was screened eight times in Minneapolis for Navy personnel, university balloon scientists and General Mills staff. The group agreed that the objects closely resembled pillow balloons in flight, while J. R. Smith of General Mills thought them a little too bright and too fast. The same group distrusted the earlier speed calculations because they assumed the camera had been held still (D102, pp. 28-29). The travel report adds that Flues "picked up some photos of pillow balloons" from General Mills (D102, p. 29). The photographs in this file fit that description, but neither they nor the card are dated, so the link is likely rather than documented.

Later efforts to trace a balloon release near Tremonton were negative, and by February 1953 the Air Force was also presenting seagulls as a strong possibility (D102, p. 80). By 1956 it described the objects as seagulls (D102, p. 127).

What the file does not show

The official summary of this document describes the General Mills contact, the late-December review, the dissenting General Mills representative, the doubts about angular velocity, the failed search for a release and the seabird films. None of that appears in these five pages. The only explanation named here is the card's "Pillow balloons or Birds." Everything else in the summary is documented in DOW-UAP-D102. This file also gives no altitude, date or place for either photograph, and does not say whether "Fig. 6" was made for the Tremonton inquiry or taken from an existing General Mills series. Nothing in the file compares the balloon images with frames from the Newhouse film.

Significance

The file is small, but it shows what the Air Force meant when it proposed "pillow balloons": a real, manufactured object, square and translucent, launched in clusters by hand. It preserves the visual case for the balloon explanation, one of the two leading candidates in 1952-1953 before the seabird attribution prevailed. The handwritten "saucer" note shows that at least one reader thought such balloons could account for a disc-like appearance. The hand-drawn question mark under the circled words on the index card is unexplained, but it echoes the doubts recorded in D102. For the full chronology, read this file together with DOW-UAP-D102 (the case file), DOW-UAP-D098 (the Navy photo-interpretation report), DOW-UAP-D104 (Newhouse's personnel record), DOW-UAP-D105 (the Washington "flying discs" file) and the film itself, DOW-UAP-PR159.

Key People

Locations

Incidents

Notable Quotes

"Group of objects milling about in rough formation" -- page 2

"No reference points by which to estimate speed, distance or size" -- page 2

"Size too small on photo to show detail" -- page 2

"Explanation -- Pillow balloons or Birds" -- page 2

"These are 'pillow balloons' 2' x 2'." -- page 5

"These could give a 'saucer' appearance when laying in a flat, horizontal position." -- page 5