The SciencesOn Ice Making and Ice MachinesBy W. N. Hartley on August 18, 1877AdvertisementABOUT THE AUTHOR(S)Recent Articles by W. N. HartleyThe Chemical Technology of Drying Oils, Oil Boiling, and BleachingThe Chemical Technology of Drying Oils, Oil Boiling, and BleachingMeasurements of the Wave Lengths of Rays of High Refrangibility in the Spectra of Elementary Substances