Many thanks to Marc Romanych for posting this archive: https://landships.activeboard.com/t65967818/naras-collection-of-british-photographs-of-world-war-i-1914-/
A bit of rummaging around produced this, which I haven't seen before: A mock battle in San Francisco, which has been discussed in Jack Alexander's book Briefly Famous and elsewhere.
The caption describes exploding grenades, but neglects to mention what's in the background:
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
You may be correct, I have enhanced the image the best I could, there looks to be lettering on the front, (Although not legible) at least to my old eyes.... It certainly resembles the Best 75 Tracklayer...
I think understatement might have been my undoing here. I had realised what was in the background. The image is, indeed, one of the C.L. Best tracklayers. I have brought it to the attention of Jack Alexander, and he says it's new to him, so that's gratifying.
The lettering is easier to make out on this better-known photo
And finally:
I posted this ages ago, but nobody took much notice. Watch this Youtube film at 6 min 55 sec.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
I've tried to contact The Military Concept Channel to ask where they got the film from, but haven't found a way. No details that I can see.
BTW, the rest of the film is atrocious. Historically all over the place, dodgy translation, narration obviously read down a line by a voice artist who has had the script emailed to him and has insufficient knowledge of the subject to spot any howlers. A lot of that goes on.
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"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.