File talk:Undular bore Araguari River-Brazil-USGS-bws00026.jpg
Mirrored photograph?
[edit]
Copy of a discussion on Wikipedia, see this diff:
Hi Dolphin, it is nice to see you active around here. I have a question regarding a photograph: File:Undular bore Araguari River-Brazil-USGS-bws00026.jpg. This version is mirrored (flipped left and right) as compared to the appearance of the photo in the original USGS publication in which it was used, i.e. Figure 5 in: Catalog of worldwide tidal bore occurrences and characteristics[1], U. S. Geological Survey, 1988.
The Commons version is scanned, which may have been done from the negative (and is easily swapped). Note that the quality of the scanned Commons version is much higher than the print version of the USGS circular. Now I was wondering whether the correctness of orientation of the photo can be determined from the shown parts of the plane from which the photo was taken (e.g. the instrument tube under the wing).
If you have time and interest: do you have any clue? Best regards, Crowsnest (talk) 21:14, 16 March 2012 (UTC)
Hi Crowsnest! I'm pleased to see you are still active, especially when users ask difficult questions on fluid dynamics!
I have looked at the two versions of the photograph of the undular bore in Brazil. I think you are right to focus on the bent tube under the wing. I assume it is a Cessna aircraft, and this is the old-style unheated pitot tube on an early-model high-wing Cessna aircraft. In fixed-wing aircraft it is most common for the pilot to sit on the left of the cockpit, and to have the most complete set of instrumentation, including the airspeed indicator. For this reason I believe the pitot tube is on the left wing, closest to the pilot. This suggests the high-quality image on Wikipedia Commons is the correct one.
I have checked a number of images of high-wing Cessna aircraft on Wikipedia and, where it is possible to identify the pitot tube, it is on the left wing. For example, click on the attached image. When I get to work on Monday I can check my theory to see how universal it is to have the pitot tube on the left wing. If I find anything extra of interest I will let you know. Best regards. Dolphin (t) 06:02, 17 March 2012 (UTC)
- Hi Dolphin, thanks a lot! I asked the right person for this question. Amazing what you can find out in this way. So probably the print version of the report is in mirror. Kind regards, Crowsnest (talk) 17:04, 17 March 2012 (UTC)
End of the copy-and-paste. -- Crowsnest (talk) 17:17, 17 March 2012 (UTC)
