Sniper nest shadows

[James Hackerott]

Interesting, how did you perform the shadow study on the Allen photo?

I just tried a quick and dirty eyeball with a protractor guesstimate. I compared the angle of the shadow on the brick wall as shown on this image:




I compared that angle to a similar shadow angle on the Allen photo of Gerald Hill in the next window to the west. And I got a roughly 15-degrees difference in the two angles. Testing for that difference in shadow angles on my 3-D computer model, I came up with a time difference of about 1-hour and ten minutes. Therefore if the Gerald Hill photo is around one o’clock, then the photo of Studebaker should be around two ten.  If this turns out to be anywhere close to accurate, then it appears to me that Studebaker must have moved the window box sometime after the Allen photo of him in the window, but before the DPD photo was taken at approximately two-twenty.

First I ran my 3D model showing me that the horizontal shadow length between the pilaster and window was unrelated to the sun's altitude within the range of a photo I took a few weeks ago at 14:43pm (azimuth 214 degrees). What I intended to do was equate that 214 degrees to 19631122 time but apparently the 14:43 stuck in my mind and was rounded to 14:45. After making the conversion as I should have the Allen photo is taken very close to the 14:20 time frame that the Studebaker photo was taken.
Thanks for checking my work.
My main question I wanted to get to was are we seeing true sun reflection on the lower portion of the pipe in Studebaker's photo, or reflection of the camera flash?

[Charles Collins]

First I ran my 3D model showing me that the horizontal shadow length between the pilaster and window was unrelated to the sun's altitude within the range of a photo I took a few weeks ago at 14:43pm (azimuth 214 degrees). What I intended to do was equate that 214 degrees to 19631122 time but apparently the 14:43 stuck in my mind and was rounded to 14:45. After making the conversion as I should have the Allen photo is taken very close to the 14:20 time frame that the Studebaker photo was taken.
Thanks for checking my work.
My main question I wanted to get to was are we seeing true sun reflection on the lower portion of the pipe in Studebaker's photo, or reflection of the camera flash?

My main question I wanted to get to was are we seeing true sun reflection on the lower portion of the pipe in Studebaker's photo, or reflection of the camera flash?


In your sim (with the window box removed) do you see the shadow on the pipe as indicated by the red arrow on Mytton’s graphic in his earlier post below? If so, I think that that shadow could be caused by the bottom member of the lower window pane. Please let us know. Thanks!

Hi Colin, thanks for the high res image and after a search for some sort of sun interaction with something on the inside I noticed the down pipe with the window frame shadow, so perhaps with the help of Charles's 3D sniper's nest model with the pipes, it should be easy enough to put in different sun angles so we can get a pretty close approximation of the time.



JohnM

[Charles Collins]

You've provided a very clear photo of the shadow being cast by the corner of the cornice.  It's easy to see that that shadow  was five bricks below the sixth floor window sill and 2 1/2 bricks east of the vertical column at  time that Studebaker was taking a photo of something in the corner of the "S. N."  ( 2:30?)    At 12 30 when Tom Dillard snapped the photo of the sixth floor window that shadow was jut four bricks below the sixth floor window sill and one and a half brick east of the vertical column...  IOW that shadow had dropped one brick  ( 2  1/4 " ) and moved the length of one brick  (8  1/2" ) east between 12:30 and 2:30.   So in two hours the point of that shadow had dropped over two inches (2 1/4 " ) and moved eastward over eight inches )

The point is:.... There is a significant difference in the place where that shadow strikes the face of the building when comparing the Powell and Dillard photos ...and there should not be any difference if the two photos wee taken just 30 seconds apart.

.



There is no difference (see below):










Both angles are approximately 24-degrees. Your problem might be that the Powell photo isn’t detailed enough to count the bricks…

[James Hackerott]

My main question I wanted to get to was are we seeing true sun reflection on the lower portion of the pipe in Studebaker's photo, or reflection of the camera flash?


In your sim (with the window box removed) do you see the shadow on the pipe as indicated by the red arrow on Mytton’s graphic in his earlier post below? If so, I think that that shadow could be caused by the bottom member of the lower window pane. Please let us know. Thanks!

The animation raises the window from 9 to 19" (approximate Dillard height). It shows the bottom of the window would send a shadow near the area indicated by the red arrow.

[Charles Collins]

The animation raises the window from 9 to 19" (approximate Dillard height). It shows the bottom of the window would send a shadow near the area indicated by the red arrow.

Great, I think that pretty much confirms (to me anyway) that it is sunlight and not a flash reflection in the DPD photo! Thanks for everything you do, I enjoy learning these details!

[Charles Collins]

The animation raises the window from 9 to 19" (approximate Dillard height). It shows the bottom of the window would send a shadow near the area indicated by the red arrow.

James, is this based on the time of day being 2:20 pm?

[James Hackerott]

James, is this based on the time of day being 2:20 pm?

Yes, 2:20 pm. I did move the camera a little to the east to better match Studebakers location.