• Brand: HP (Hewlett-Packard)
• Item: HP-41C Machine Design Pac application module manual for HP-41 series programmable calculators
• Format: Spiral-bound original printed manual in English
• Publication details: June 1981 edition, document number 00041-90123 Rev. B, Hewlett-Packard Company, 1000 N.E. Circle Blvd., Corvallis, Oregon, printed in U.S.A.
• Contents: Introduction, contents overview, inserting and removing application modules, format of user instructions, and a word about program usage.
• Machine design programs: circular cams; generation of a four bar linkage; progression of a four bar system; progression of a slider crank; gear forces; standard external involute spur gears; helical spring design; forced oscillator with arbitrary function.
• Additional topics: coordinate transformation between reference and rotated Cartesian systems, points on a circle, circle defined by three points, and unit conversions.
• Program resources: detailed equations and variable definitions, diagrams and graphs, tables of engineering data, keystroke listings, step-by-step instructions, and worked example problems tailored to the HP-41C.
• Appendix: program data tables summarizing key variables, register contents, and function labels for the Machine Design Pac programs.
• Compatibility: Designed for use with the HP-41C Machine Design Pac application module and HP-41 series calculators.
• Keywords: HP 41C Machine Design Pac, calculator manual, mechanical engineering, cams and gears, helical springs, coordinate transformations, unit conversion, vintage HP documentation.

• Condition: Scarce and collectible vintage HP spiral-bound manual with only mild cover rubbing, light edge and corner wear, and a few small surface scuffs on the front and back panels. Plastic spiral binding is intact with no broken coils and the manual lies flat. Interior pages are clean, complete, and legible with no writing, highlighting, or loose sheets. Manual only; calculator, Machine Design Pac application module, and any overlays or accessories are not included. The illustrations and text are as crisp and clear as the day this jewel rolled off the press.

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