Show NEW SCIENCE OF FREEZING production of cold bee bec r ing important Inra enli mry try machines on big vessels the production ot of artificial cold bold has during the last is 15 years become quite an important industry freezing inn ina chinos arenow among the permanent of civilized life tho the refrigeration of perishable articles of food tor for transport tian sport by scip stands first on the long list of commercial applications of the in the cold air freezing machi machines neg now employed inboard onboard on board ships tor for the transport of meat from australia new zealand and america the meat Is placed in large chambers the walls wall of nelch are double the being filled with wood charcoal as a conducting non material A jet of intensely cold air Is delivered into the chamber at each stroke 0 of f the piston of the expansion colln der and the temperature of the aham her ber Is thus kept at or near tho the freezing point during the whole voyage another interesting application of cooling by means of solutions tlona which have a very low freezing point has lately been made in mines one of tho the greatest difficulties midch can occur in the operation of sinking a shaft Is that presented by a stratum of 0 f sand saturated with water in r nore more than one case this difficulty culty has been overcome by freezing the sand and water into a firm mass through which the shaft abaft can then be easily bored as into a solid rock |