AT-CULATOR (this name is trademarked); The Atomic calculator--The Circular rule for interconverting weight and atomic percentages
Albany, OR: Albany Enterprises, Inc., 1969. Presumed First Edition, First printing. Circular slide rule with separate instruction manual (pamphlet). The diameter of the tool is approximately 8.25 inches. On the one side there a series of circles with figures, including C and F temperature, and abbreviations for the elements. There are two clear plastic arms, one labeled S and the other L. On the reverse side there is a slide with aperture and sections on each side under Element for group/period, atomic number/atomic weight, crystal structure/Transformation temperature, Lattice Parameter A/Atoms per unit cell; Melting Point/Heat of Fusion, Boiling Point/Heat of Vaporization. Specific Heat/Electrical Resistivity, 1st Ionization potential/neutron absorption. Oxidation States/Acid Base Properties, Atomic Radius/Density, Ionic Radius/Molar Volume Covalent Radius, Electron/Structure. There are lists on either side of Symbol Element and conversion factors at the bottom. This is in an appropriately shaped leather pouch. Accompanying this device/rule is an Instruction Manual for At-CULATOR: The Circular rule for interconverting weight and atomic percentages. This was written by Laurance L. Oden, Ph.D. a research chemist. It is 12 pages, counting the covers. It has illustrations. It provides a description of the AT-CULATOR, the Operation of the AT-CULATOR (including interconverting weight and atomic percentages and Circular Slide rule operations (multiplication, division, combined operations, and proportion). It then addresses the Theory of the AT-CULATOR and provides practice problems and solutions. Dr. Oden appears at some point to have joined the Department of the Interior, Bureau of Mines. Converting from atomic percent to weight percent: For each element listed in the compound, multiply the atomic percent of the element by its atomic weight [the larger of the two principal numbers listed for each element in the standard periodic table]. For each element, let’s call this value p. Add all the values of p together, and let’s call this value p(Total). Now, for each value of p, divide it by p(Total), to obtain w. Multiplying the resulting values of w by 100 gives us the weight percent values, for each respective element in the starting compound. Converting from weight percent to atomic percent: For each element listed in the compound, divide the weight percent of the element by its atomic weight. For each element, let’s call this value m. Add all the values of m together, and let’s call this value m(Total). Now, for each value of m, divide it by m(Total), to obtain a. Multiplying the resulting values of a by 100 gives us the atomic percent values, for each respective element in the starting compound. Condition: Very good for the calculator, good for the Instruction Manual.
Keywords: Atomic Weight, Atomic percentage, Circular Slide Rule, AT-CULATOR, Scientific Tool, Instruction Manual, Interconverting
[Book #83996]
Price: $250.00