Technical Drawing Summary

This is an engineering drawing (Contract 4) depicting the detailed specifications and manufacturing requirements for a rubber seal assembly. The drawing shows an elevation view of the manufactured part with right-hand orientation, including multiple cross-sectional views (Sections A-A, B-B, and C-C) that illustrate the internal structure and dimensions of the seal.

The seal specifications include fabric-reinforced winded natural or synthetic rubber construction with dimensions approximately 24 inches in length. The design incorporates 4-ply nylon reinforcement (typical) and requires specific material properties including shore durometer Type A rating of 60-70, compression set at 25% deflection (5 maximum), tensile strength of 3500 psi, tensile strength after aging at 5 of original of 2100 psi, and elongation at break of 500 (5 of minimum). The drawing mandates that the seal be cut at assembly to fit mitered joints of side and end components with a top seal (Part #209D) and specifies that various components be listed with approximate percentages. Manufacturing notes require using a top seal keeper at assembly and indicate that fabric reinforcement shall be cotton duck frictionless and skin-coated to a minimum thickness with specific directional grain-strength method requirements. The document is marked as "APPROVED" and includes revision stamps dated July 1950 with reference number 203D101OR.