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I notice that in this pic there is a flap on the back of Horatio's machine.Is it a "doggy door" or an elevator?
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It's very definitely an elevator, or "horizontal rudder" as Horatio Phillips referred to it. Here's a close up of the item in question:
In the 'other' photo of the 1907 Multiplane, the one showing it from the front-quarter, you can make out two sets of levers and crankarms leading off from the left of the pilot: this is the control mechanism for the elevator. There was a vertical rudder as well, but it seems Horatio didn't fit it to the machine when he was testing it.
The photo you posted is quite familiar to me, as I was the one who originally got it scanned and uploaded to the internet! A few years ago, I'd gone to a research library to check out century-old issues of a British journal called
"Engineering", which frequently reported on the work of Horatio Phillips. It was while I was reading those old journals that I came across the photo. The image also forms part of this small website I'd made:
Cheers,
Paul