Re: gallows structure

dougvv Wrote:
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> Oddly enough, I never understood the naming
> convention. I thought there was an "A" frame
> turntable and then a gallows turntable. Many call
> the "A" frame a gallows.
>
> Is an "A" frame a subset of a gallows type?

Doug,

I'm not sure of the proper naming conventions, however I have seen blueprints from the mid to late 1800s for A-Frame turntables that say "Gallows" in the title block.

As far as I know the A-Frame style came first, then the larger style, as in your photograph, was developed for larger motive power. Which quickly gave way to riveted iron plate truss style turntables.

I would agree that the A-Frame and the (for lack of a better term) Four-Post turntables are both "Gallows" style.


Cheers,

Curtis F.