A Disk Calculator
Abstract:Frederickson (1) and Goldspiel and Conner (2) have described circular calculators for computing intensity ratios and determining composition. One factor discouraging the use of such a calculator is the difficulty in preparing an exact circular two-cycle log scale of sufficient size and accuracy. This problem has been circumvented by the "zerox" (or photostatic) enlargement of the A scale of a 8-in. circular slide rule to a 10-in. diam. The reproduced scale is attached to an aluminum disk, 1/16-in. thick. Relative intensity values for each unit mark of % transmission are tabulated from the customary emulsion Seidel calibration curve. These data are laid out as a circular Seidel % transmission scale on the circumference of a smaller disk 9-in. diam. A special ruler made from rigid transparent plastic is cut so that a radius at the outer end serves as a ruling edge when the two disks and ruler are held concentrically by a bolt, nut, and washer. With the two disks being held together the Seidel % transmission values are marked on the smaller disk at relative intensity positions indicated on the outer log scale.
Document Type: Research Article
Affiliations: Mellon Institute, Pittsburgh 13, Pa.
Publication date: January 1, 1961
More about this publication?
- The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)
- Editorial Board
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Membership Information
- Request copyrighted SAS materials
- Spectroscopic Nomenclature
- Focal Point (Open Access)
- ingentaconnect is not responsible for the content or availability of external websites