Le croquis-livre pictural de Pennsylvanie : ou, son paysage, les améliorations internes, les ressources, et l'agriculture, décrit populairement . autre piste, la cloche est de nouveau sonnée, et la voiture vide descend et les servantes, comme avant. Ce levage et abaissement des voitures est en marche avec l'expédition pendant la journée, et parfois pendant toute la nuit, il y a souvent deux ensembles de mains et de mineurs, l'un pour la journée et l'autre pour la nuit. Le temps habituellement occupé à renoncer à une voiture est d'environ une minute, ce qui inclut attacher et détacher la voiture de la chaîne, &c. Où de

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AXFR15
• Taille du fichier: 7,1 MB (548,6 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1943 x 1286 px | 32,9 x 21,8 cm | 13 x 8,6 inches | 150dpi

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The pictorial sketch-book of Pennsylvania : or, its scenery, internal improvements, resources, and agriculture, popularly described . other track, the bell is again rung, and the empty car descends and the loaded oneascends, as before. This hoisting and lowering of cars is alwaysgoing on with despatch during the day-time, and sometimes duringthe whole night, there being often two sets of hands and miners, one forthe day and the other for the night. The time usually occupied forbringing up a car is about one minute, which includes attaching toand detaching the car from the chain, &c. Where from one to twohundred tons of coal are prepared and shipped daily, (besides the ANTHRACITE COAL FORMATION. 189 refuse and accumulated rubbish of the mine, which must be broughtup, ) it will be seen that it forms one of the most important featuresin mining. The next feature in mining is that of preparing the coal for market, that is, cleaning it from the slate and earthy matter that sometimes ismixed with it, and breaking it in suitable sizes for the various pur-poses required. The coal dirt, consisting of small particles of coal. PIG. 54.—COAL BREAKER. and slate, besides various kinds of earthy matter excavated in themine, is hauled out and deposited in heaps along the sides of the hills, where it sometimes forms large elevations. The loaded coal cars, which are here represented as coming from a drift, or a mine abovewater-level, are seen on the left, running, by a slight inclination, tothe Coal Breaker, which is represented in fig. 54. To fully retainthe idea, the loaded cars are seen coming out of the mine, and goingdirectly to the Breaker works. The Breaker machinery is, of course, erected as near to the mouth of the mine as- local circumstances willadmit, and considerable elevation is necessary in order to break andprepare the coal at as little expense as possible. The side of a hill istherefore preferred, as a railroad to conduct the coal from the mouthof the mine to the Breaker

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