. Mining and Scientific Press . mes only ten minutes of everyhour, such a retort would be idle for lfi^% of the time, or50 days out of a 300-day working year. Heat is wastedduring the idle period if the retort is kept hot, or an August 20, 1921 MINING AND SCIENTIFIC PRESS excess of heed is required in starting if it is allowedto eoul down. A non-continuous type of apparatus can-not be made as nearly automatic as a ttinuous n and consequently requires a greater labor and superin-tendence charge per t< apadty. Minimum Number of Moving Parts. The number ofmoving parts required should be kept a
. Mining and Scientific Press . mes only ten minutes of everyhour, such a retort would be idle for lfi^% of the time, or50 days out of a 300-day working year. Heat is wastedduring the idle period if the retort is kept hot, or an August 20, 1921 MINING AND SCIENTIFIC PRESS excess of heed is required in starting if it is allowedto eoul down. A non-continuous type of apparatus can-not be made as nearly automatic as a ttinuous n and consequently requires a greater labor and superin-tendence charge per t< apadty. Minimum Number of Moving Parts. The number ofmoving parts required should be kept at a minimum no1only for the reasons ondei efficiency, bul also hay. purpose by introducing an im ible amounl of complicated ma< him Minimi i ions thai obtain operating economy, fuel requirements should be kepi at a minimum. For this reason full should be made of all possible heal applied | 1 I by designing an ii nt Purni ontrolling tin- heal applied, ami (3) by recovering some t the In at at leas) from the. ScnjfKr bor\
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