TechnologyLearning to Use the InstrumentBy Frank Challis, John F. Brandt on September 1, 1933AdvertisementABOUT THE AUTHOR(S)Recent Articles by Frank ChallisThe Amateur and his Microscope—IV Use and Care of the InstrumentRecent Articles by John F. BrandtThe Amateur and His Microscope--XII Some Tricks of the TradeThe Amateur And His Microscope—X Mounting SpecimensThe Amateur and His Microscope--IX