Eugene Dietzgen: Compound Trig-Easy Calculator
I purchased this cool, vintage formula card on Esty from the Lost Angeles Vintage Co. in Wofford Heights, California.
The Compound Trig-Easy calculator is a 1943 formula reference card for calculating angels and lengths (dimension) of right triangle pyramids and rectangular pyramids. Following are some example calculations.
sec E = tan C * cot B
H = D * csc C * csc E
tan D = sin J * csc S
cos R = cos G * sec S
Eddie
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