I have it on good authority that there were 6 Motor Mobile Pigeon Lofts.No6 was the Canadian army loft and seems to have been built on a lorry chassis.The other 5 were all similar.
Acc to Roy Larkin, six buses were converted in late 1916 and a further six in 1917. Prior to that, mobile lofts were constructed on GS Wagon bodies. I think there's a pic of the latter on the Forum somewhere.
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Is this picture helpful? I would have said it's a well-known photograph but that may just be because it's well-known to me. I can't find any trace of it having been posted to the Forum in the past.
According to the caption, the motor-cyclist is Canadian so I assume it's the Canadian Loft. No sign of stairs at the back but that may just be the angle the photograph was taken from.
The bus conversions? As James said there are pictures of all sorts of mobile lofts, including those. in other topics, just search the site for pigeon - but this rather good one was posted by LincolnTanker in one of those a while ago:
The cages on the upper deck were designed to fold flat when the vehicle was moving. And I've never weighed a pigeon, but I don't think they're all that heavy.
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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.
Anyroads, takes quite a few of them (pigeons) to satisfy a hungry man James (no wonder dovecotes were reserved for the posh folk). But I wonder when vehicle tilt tests and standards were introduced? Can't see those early bus types doing well in such metrics, even in their original configuration. No doubt they well-satisfied the Clarkson test of straddling a sleeping policeman without harm to either one.