DOW-UAP-D102: Project Blue Book File on Tremonton Film, Utah, 1952

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• Appendix II
Plotting e Set of Flight Pats from Single rame Position Plots, with no Reference
Points
1. In a case liKe this, it would be highly desirable if t e ovement of
these objects could be recoro.ed with a stationary motion picture camera. Position
plots could be s~r· 2ose by observing proper registery of frame edges to in
dicate the speed an direction of object flight paths .
2. However , it apparently was necessary in this case to follow the form
ation of objec~s , to keep them all in view. Therefore no position guide for
registering the position plots is available , since no fixed points appear in the
sky. Other ~rinciules must be used instead.
3. It is stated that the general drift of the entire formation was to the
west . A later secuence shows a siDFle object , hich bad reversed course , moving
from left to right in the camera 1svi.ew. It can therefore be suouosed that ulotted
paths should show a drift from right to left .
4. This is one guide to be used . Another is that uosition ulots should be
superimposed ~~thout any rotation , since the frames were ulotted without rotation.
This assumes that the camera was not rotted. ; but merely moved in combined
horizontal and vertical motions.
5. Another general guide is that most of the objects should appe(" r to move
in smooth, cont·nuous paths . Several plots, at least 4, snould be superimoosed
on a viewing table, and should be shifted until all or nearly all paths are smooth
and show reaso:nabJ..i uniform motion . This co _ound plot can be transferred to a
single sheet, anu further plots can be added in the same manner.
6. Figure II was prepa.red in just this ,,:ay, using the same 50 diameter en
largement as in Figure I . It will be noted that the final positions of two
objects in the central trio are missing . They became so faint that they were lost;
no further plotting of this sequence was tried.
DECLASSIFI ED Authority NND 923007