Ascertain availability of the Trinity image at t = 3.26 ms

Ascertain whether a photograph or film frame corresponding to time t = 3.26 milliseconds exists within Julian Ellis Mack’s “Semi-popular motion-picture record of the Trinity explosion” or within the image set used by Geoffrey I. Taylor in “The Formation of a Blast Wave by a Very Intense Explosion. II. The Atomic Explosion of 1945,” and, if it exists, identify its source to enable consistent radius measurement at that timestamp.

Background

To emulate Taylor’s radius measurements, the authors annotated frames from Mack’s film and images presented by Taylor, using CVAT and geometric methods to estimate shock-front circles.

They report that one specific frame at t = 3.26 ms cited by Taylor could not be located, which introduces a gap in reproducing the full dataset and potentially affects consistency in radius-time fitting.

References

To emulate his radius measurements we made use of the open source Computer Visualization Annotation Tool (CVAT) \citep{boris_sekachev_2020_4009388} to annotate the sets of photos by Mack \citep{RN4} and the others presented by Taylor in his second paper \citep{RN6}, though we could not find an image for $t=3.26$ ms.

— Revisiting Taylor and the Trinity Test  (2403.19657 - Mone et al., 2024) in Section “Revisiting Taylor’s Analysis”, first paragraph