The Calculating Board

Included as parts of the calculating board are a movable vertical scale with a percentage T scale presented logarithmically. A Seidel function scale 

FIGURE 8-12. Calculating board for processing spectrographic data from photographic recording of spectra. [Courtesy Jarrell-Ash Division, Fisher Scientific Co.] 

The movable vertical scale and the horizontal slide rule scales are convenient to plot emulsion calibration curves and working curves. The working strip board permits the preparation of intensity ratio scales for a series of different elements. Any calculating board uses the principles of emulsion calibration and working curve preparation that were presented in earlier sections of this chapter. The board makes the plotting of the data more rapid and convenient and is especially useful for routine repetitive analysis and multielement analysis, especially when one emulsion calibration curve is sufficient. 

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