Interesting slide rule charts by IWA model 0756, made in Germany for the Armstrong Company in 1970’s. One side is for special calculations for air humidifiers and the other for normal calculations using standard scales. It is in good condition with small signs of use but some darkening of the see-through plastic on body and cursor. It is fully functioning with all parts intact. It measures ca 18 cm or ca. 7 1/4 inches long. Check the attached video on how to work your vintage man tool: slide rule operation instructions!
IWA 0756 Armstrong-Luftbefeuchter air humidifier slide rule 1970 Germany
€25.00
IWA 0756 Armstrong-Luftbefeuchter air humidifier slide rule, made in the 1970’s in Germany
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