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Al Shukle's Gilbert Erector-Built 8½ Walking Beam Engine

Al writes: "[This is an] 8½ style Walking Beam. Wheel consists of two circles of E curved girders joined with 7/8" bolts. String drive around periphery of wheel. Modified walking beams use MF plates. Wheel supports were doubled used I 21 hole strips to make built-up curved beams. Walking beams are phased 90 degrees apart."