The Pine Lodge Bridge aka The Bluffs Evans and Angola NY
Photo uploaded by Art S
View this photo at ebay.com
BH Photo #352369
If you break it down to the basic design of the trusses (which is honestly what I did), the bridge is composed of a series of Kingpost panels. I confess to being ignorant in the sense that I've always known the Howe truss as it appears in Indiana (Bean Blossom aside). That being a predominantly wooden structure with double diagonals and single counters. Of course the vertical were composed of iron rods, of which I've seen anywhere from 1 to 3. I've only read sparsely on patents, but it has always been my understanding that Mr. Howe's idea was to improve a basic truss design by adding those iron rods that could be adjusted as needed. The Bean Blossom Covered Bridge shows the earliest format in wood, that being a single diagonal with a single iron rod (in the Kingpost format). Was this "Single" design ever patented? I have only ever seen patents for his latter X panel configurations. Of course the truss would find it's way into structures composed completely of iron, with the X panel again being the norm while the single remains as somewhat of an anomaly.
So all rambling aside, I don't think that either label is necessarily wrong. You are correct in that the term "Multiple Kingpost Truss" seems to be reserved primarily for wooden covered spans. But yet I find it interesting that a Kingpost Truss can be of wood or metal. So yes, wrong or not, when I looked at this bridge I instinctively saw a Multiple Kingpost truss.
Not being an expert on anything involving covered bridges, might you be able to explain what the difference between a Howe and Multiple Kingpost is in terms of metal trusses? When I look at a diagram of a multiple kingpost it looks the same as a Howe. But I never thought much about it as I don't deal with covered bridges. I've never heard of a Multiple Kingpost being used to describe a metal truss. I always was told, diagonals pointing down = Pratt, Diagonals pointing up = Howe.
Ah yes, the oft maligned Howe single truss. I'm not sure why if that type could find it's way into both wood and metal spans why the MKP couldn't as well. If anything this structure is a bit of a misnomer with it's smaller secondary diagonal in each panel.
I classified this as a Howe truss on my website I don't know why its listed as a "multiple kingpost" here, as far as I know that's a truss design unique to covered bridges, which this bridge is not.
Isnít this a Howe truss
It's rather unusual to see a metal Multiple-Kingpost truss instead of a Pratt. I'm not one proficient at dating photos by people's clothing, but if I had to guess I'd say that pic is from the 20's or 30's. This is a unique little span that deserves to be rehabilitated for reuse.