DescriptionThe diagram provides a sectional view of the trolley wheel assembly, showing the internal components. Handwritten annotations label key components, including the axle journal, trolley frame, hub spring contact, and friction feed. The notations suggest a mechanical analysis, possibly related to a patent dispute or mechanical failure analysis. The number "94" is written in the lower right corner, likely indicating a reference or exhibit number in a larger collection. The paper appears aged, with creases and slight discoloration.