War.gov PURSUEDepartment of War
GovernmentJuly 2, 1952Analysis complete

DOW-UAP-D102 — Tremonton Film: Conflicting Technical Assessments

This Project Blue Book file preserves Delbert C. Newhouse’s account and film submission from the 2 July 1952 Tremonton incident. Newhouse said the sky supplied no fixed reference for estimating distance, size, altitude, or speed. Navy analysts favored an unidentified light-source interpretation under disputed assumptions, while later reviews considered balloons, birds, insects, and mirage; one 1956 study remained inconclusive before an Air Force memo adopted a seabird explanation.

File
Document · Release 06
Date
July 2, 1952
Location
Tremonton, Utah
Extent
156 pages

Probed Assessment

A long case file that preserves the witness statement, film-custody record, and competing technical assessments, with critical distance and camera-motion uncertainties left unresolved by the imagery.

Key takeaways

  • Newhouse reported about ten or twelve objects near Tremonton and filmed them with a handheld 16 mm camera.
  • He explicitly said the empty sky provided no reference point for estimating speed, size, altitude, or distance.
  • The Navy light-source and disk-size conclusions depended on an arbitrary five-mile distance and other motion assumptions, and its report acknowledged incomplete corroboration and resource limits.
  • Balloon specialists thought pillow balloons resembled the film, although one expert dissented and no Navy release was documented near the location.

Why it matters

The file shows how the same motion-picture evidence produced sharply different official interpretations and makes the assumptions behind its strongest numerical and shape claims inspectable.

Corroboration

The released file directly supports Newhouse’s submission details, the custody correspondence, and the stated contents of each technical review. It does not independently establish the objects’ distance, physical dimensions, linear velocity, material, or identity, and repeated copies of the witness account are not separate corroboration.

Open questions

  • Which generation of the film was used in each surviving analysis and how much detail was lost through duplication?
  • Can the original camera motion be reconstructed well enough to test the historical velocity calculations?
  • What surviving comparison films or measurement records underlie the Air Force’s final seabird judgment?

Probed separates this editorial assessment from the source claims below. It summarizes what the released artifact supports; it is not independent verification.

Official Description from War.gov

This document records the Project Blue Book investigation and subsequent assessments of an incident near Tremonton, Utah, on July 2, 1952. Project Blue Book was a 1952-1969 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFOs). The file describes the Air Force’s assessment of the principal witness, Delbert C. Newhouse, a U.S. Navy Warrant Officer specializing in photography, as honest and reliable, and as an expert with more than 1,000 hours of aerial-photography experience. Newhouse reported observing 12 to 14 reflective objects and recorded the event on color motion-picture film using a handheld Bell & Howell Auto Master camera. The file reflects an evolving Air Force assessment of the imagery over several years. Early documentation considered several possible explanations, including sunlight reflecting from birds or balloons, and a mirage effect, and did not identify the objects conclusively. Later assessments became more confident that the objects were seabirds reflecting sunlight, citing identifiable seabirds and similar films showing seabirds as bright points of light under comparable conditions. However, the film’s limited detail and lack of fixed reference points prevented reliable determination of the objects’ distance, size, altitude, or linear speed from the film alone. AARO Comment: The file contains conflicting references to the film format. Several documents describe a 35mm film, while contemporaneous submission documentation identifies the original as a 50-foot roll of processed 16mm Kodachrome color motion-picture film recorded with a handheld Bell & Howell Auto Master camera. Newhouse reported exposing approximately 30 feet of the roll during the incident and using the remaining film later that day to record unrelated mountain scenery in Idaho. Other records show that 35mm positive and negative duplicate blowups were produced from the original 16mm material. The file also indicates that the original film was duplicated for preservation, citing its deteriorating condition. The footage retained by the National Archives and Records Administration and presented in this collection as DOW-UAP-PR159 is a digitization of a 16mm print.

Preserved verbatim as source metadata. This wording is separate from Probed’s file-specific description and assessment.

File Context

Related entities

24

Tracker findings

13

Newhouse dates and locates the Tremonton filming

Newhouse’s submission places the observation about seven miles north of Tremonton at 1110 on 2 July 1952 and identifies a handheld 16 mm camera operating at 16 frames per second.

Newhouse reports a rough group moving west

Newhouse reported about ten or twelve objects milling in a rough formation and proceeding westward.

The witness had no fixed measurement reference

Newhouse said the empty sky supplied no reference point, preventing him from estimating the objects’ speed, size, altitude, or distance.

The brittle original was duplicated for preservation

The Naval Photographic Interpretation Center reported that the Utah film was dry and brittle and duplicated it to preserve the footage.

Navy densitometry used a duplicate and partial-image readings

The Navy report cautioned that its densitometry could not measure whole objects at maximum image size and was performed on a duplicate of a copy, raising a possible image-burnout problem.

Navy analysts favored an unidentified light-source interpretation

The Navy analysis team’s majority opinion treated the images as light sources and said it could not identify them as natural phenomena or commonly known man-made objects; the file does not establish that interpretation independently.

The disk and size result depended on assumed distance

The Navy report’s apparent oblate or disk-shaped description and 98-foot maximum size were calculation results conditioned on an assumed five-mile distance, not a directly observed object shape or dimension.

Velocity calculations rested on three explicit assumptions

The Navy velocity calculation assumed a steady camera, motion perpendicular to the optical axis, and an arbitrary five-mile distance.

The Navy report acknowledged no corroboration and limited resources

The Navy report stated that its findings had not been corroborated and that the investigation was limited by equipment, money, and personnel.

Balloon specialists agreed broadly but one expert dissented

Balloon specialists who repeatedly viewed the film generally thought the objects closely resembled pillow balloons, while General Mills’ J. R. Smith considered them too bright and fast for that explanation.

Astronomers challenged the Navy brightness method

An internal Air Force memorandum said two astronomers judged the Navy’s image-brightness method wrong, undermining the report’s conclusions and motivating proposed comparison tests.

Baker found no single natural hypothesis sufficient

After considering insects, mirage, camera artifacts, and birds, Baker wrote that the evidence was contradictory and no single proposed natural hypothesis completely accounted for the objects.

A later Air Force memo adopted the seabird explanation

A June 1956 Air Force memorandum said a later blind review identified the images as bird reflections and asserted there was little reasonable doubt that the objects were seagulls; this was an agency conclusion rather than independent proof.

Release provenance

Release
Release 06
Official ID
release-06-file-001-dow-uap-d102-project-blue-book-file-on-tremonton-film-utah-1952
Cleared
Sep 18, 2026
Official release source

Referenced Timeline

  1. Page 28

    Balloon specialists review the film

    Flues convened Office of Naval Research, university, and General Mills specialists in Minneapolis to compare the film with pillow-balloon behavior.

  2. Page 113

    Tremonton observation filmed

    Newhouse’s statement places the observation and filming near Tremonton, Utah, at 1110 local time.

  3. Page 113

    Newhouse submits the processed film

    Newhouse forwarded a 50-foot roll of processed 16 mm color motion-picture film to Hill Air Force Base.

  4. Page 26

    Air Force opens pillow-balloon inquiry

    A. G. Flues contacted Malcolm Ross to ask whether pillow-balloon releases could account for the incident.

  5. Page 74

    Navy final analysis reports an unidentified light-source interpretation

    The Naval Photographic Interpretation Center issued its final analysis while documenting significant assumptions and limitations.

  6. Page 45

    Navy reports custody of duplicate materials

    The Navy center said it had never held the original and listed the 16 mm and 35 mm copies in its custody.

  7. Page 88

    Baker completes an inconclusive photogrammetric review

    R. M. L. Baker Jr. completed a review that tested several natural alternatives without reaching a definite conclusion.

  8. Page 127

    Air Force memorandum adopts the seabird explanation

    The Air Force memorandum summarized its later view that bird reflections, specifically seagulls, explained the bright spots.

Source Claims

Claims are attributed to the released source and remain distinct from Probed’s assessment and tracker findings.

Reported by source12Source interpretation9
Source reportedAssertedPage 113

Newhouse’s submission places the observation about seven miles north of Tremonton at 1110 on 2 July 1952 and identifies a handheld 16 mm camera operating at 16 frames per second.

Place: About 7 miles north of Tremonton, Utah on U.S. Highway No . 30S. Time: 1110 Wednesday 2 July 1952. Camera: B&H Automs.ster, magazine load, 3 11 telephoto lens, 16 frames per second. Handheld.

Source reportedUnverifiedPage 113

Newhouse reported about ten or twelve objects milling in a rough formation and proceeding westward.

There was a group of about ten or twelve objects -that bore no relation to anything I had seen before -milling about in a rough formation and proceeding in a westerly direction.

Source reportedAssertedPage 113

Newhouse said the empty sky supplied no reference point, preventing him from estimating the objects’ speed, size, altitude, or distance.

There was no reference point in the sky and it was impossible for me to make any estimate of speed, size, altitude or distance.

Source reportedUnverifiedPage 113

Newhouse reported that one object reversed course; he then held the camera still while it crossed the field of view several times.

Toward the end one of the objects reversed course and proceeded away from the main group. I held the camera still and allowed this single one to cross the field of view

Source reportedConfirmedPage 113

The submitted evidence was described as one 50-foot roll of processed 16 mm color motion-picture film.

One (1) fifty-foot roll of processed 16mm color motion picture film

Source Material & Evidence

document

Official released Project Blue Book Tremonton case file

Department of War release-06, 156-page D102 PDF.

statement

Delbert C. Newhouse film-submission statement

Signed 11 August 1952 submission reproduced on PDF page 113.

public_record

Naval Photographic Interpretation Center final analysis

4 May 1953 report reproduced on PDF pages 71–77.

paper

R. M. L. Baker photogrammetric analysis

16 May 1956 analysis reproduced on PDF pages 83–88.

Research Map

24 entities · 60 grounded links

Lines appear only when two entities share a row-level source claim or dated timeline event. Unconnected nodes remain visible without implying a relationship.

UAP/Disclosure Graph
24 nodes60 links