Backyard Bird Feeder

Catenary Arch Suspension Bridge Seed Span

A miniature architectural bridge feeder that uses tension cables and wooden support piers to suspend a central seed trough, simulating a classic suspension span.

Catenary Arch Suspension Bridge Seed Span

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Catenary Arch Suspension Bridge Seed Span — step 1
Step 1

Construct two sturdy cedar pier towers using mortise and tenon joinery to ensure they can support the weight of the suspended bridge. Ensure the bases are weighted or designed for stable mounting onto a horizontal railing or flat surface.

Catenary Arch Suspension Bridge Seed Span — step 2
Step 2

Fabricate the central seed trough by hollowing out a solid block of reclaimed hardwood, ensuring drainage holes are drilled along the bottom. Smooth the interior surfaces to prevent moisture buildup and make cleaning easy between refills.

Catenary Arch Suspension Bridge Seed Span — step 3
Step 3

Install brass eye hooks along the top of the towers and the sides of the trough to anchor the stainless steel suspension cables. Use turnbuckles to achieve the signature catenary arch profile, which creates a natural, elegant curve in the structure.

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Catenary Arch Suspension Bridge Seed Span — step 4
Step 4

Apply a marine-grade exterior oil finish to protect the wood from harsh weather conditions and prolong the lifespan of the miniature suspension system. Install a lightweight overhead canopy made of copper sheeting to keep the seed dry during inclement weather.

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