Interesting set of 2 circular slide rule(rekenschijf in Dutch) charts, both made by ARO from Holland in Dutch (one signed). One is for a planning company to calculate possible noise form the railways (both people as goods transports) the other one is for calculating the difference in sound between levels of a building for the Ministry of Housing. They are both in good condition with one showing some sun yellowing. They are fully functioning with all parts intact. The both measure ca, 13 cm or ca. 5 1/4 inches in diameter. Check the attached video on how to work your vintage man tool : slide rule operation instructions!
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2x ALRO sound noise slide rule charts 1980 Holland
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2x ALRO sound noise slide rule charts from the 1980’s, made in Holland
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