. Electric railway journal . arged with the cur-rent used by track tools, but for those interested thefollowing data are submitted: On a test to determinethe amount of energy required to melt a pound of low-carbon steel, it was found that the grid-resistance typeof machine used , while the dynamotor con-sumed 4 The test covered actual working condi-tions over several days, the metal being weighed and theenergy metered with a kilowatt-hour meter. The application of thermit welding to track construc-tion is now thoroughly established. Joints may bewelded, special trackwork ma
. Electric railway journal . arged with the cur-rent used by track tools, but for those interested thefollowing data are submitted: On a test to determinethe amount of energy required to melt a pound of low-carbon steel, it was found that the grid-resistance typeof machine used , while the dynamotor con-sumed 4 The test covered actual working condi-tions over several days, the metal being weighed and theenergy metered with a kilowatt-hour meter. The application of thermit welding to track construc-tion is now thoroughly established. Joints may bewelded, special trackwork made on the property, brokenpieces of special trackwork may be repaired and truck-frame and other heavy welding repairs may he done inthe shops. To the company possessing a pneumatic tie-tamping machine or other adequate portable air-com-pressor unit the cost of acquiring additional equipmentfor a thermit welding plant is small. The illustrationsreproduced herewith show the set-up for the repair of 520 Electric Railway Journal. cOMlRESyEU AIR EQUIPMENT FOR REMOVINGCONCRETE IN TRACKS a broken iron-bound, guarantee mate, the break occur-ring through the rail about 1 in. from the cast-ironframe. The mate was removed from the track andthe compressor for furnishing air to the burner usedfor drying the mold was mounted in a farm wagonand placed alongside of the track. The weld was suc-cessful at a cost of less than one-third of the cost ofa new piece, and owing to the fact that the weld wasin the nature of an experiment the cost was undulyhigh. OXYACETYLENE USED FOR CUTTING AND BONDING It would not be fair to leave the subject of weldingwithout some reference to the use of oxyacetylene as acutting and welding agent. Owing to the availabilityof electric current, its use in track welding has beenlimited in favor of arc welding. In the shops and forbonding it has a wide application. It is superior tothe electric arc for cutting and can be used profitablyin trackwork for this purpose. A co
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