Catalogue : mathematical and engineering instruments and materials manufactured and imported by James W. Queen & Co. (1880)
James W. Queen & Company · James W. Queen & Co. · leaf 184
s of Air in Coal Mines, Aim Ventilators, Flues, etc., of Public Builb-inos. The Anemometer, an instrument invented for the purpose of measuring the rat*at which air moves in rained and ventilation passages, is now an Indispensable ad*junct of the former, the mining lawa of moat States requiring…
