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![Cover for A M (Alexander M ) Chisholm · Key to Chisholm's Mathematical Mechanical Scale [microform]: an Instrument for Solving All Problems in Arithemetic, Geometry, and Trigonometry, Right-angled and Oblique, Plane and Spherical: Without the Aid of Tables, Except Those of Latitude And... (Paperback Book) (2021)](https://imusic.b-cdn.net/images/item/original/153/9781014944153.jpg?a-m-alexander-m-chisholm-2021-key-to-chisholm-s-mathematical-mechanical-scale-microform-an-instrument-for-solving-all-problems-in-arithemetic-geometry-and-trigonometry-right-angled-and-oblique-plane-and-spherical-without-the-aid-of-tables-except-those-of-l&class=scaled&v=1661027775)