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A practical treatise on mine engineering (1855)
Greenwell, G.C · Lambert · leaf 281
PW PLATE 60 . U APPAAA ' rJS , ^ SSSS ^ f } . Fig . 3 … SCALE OF FIO I / z > 2 Fig . , 5 . 11 mm . . . . ; ilrnririrniiir “ “ - SCALE OF FIG 6 J ( > feet e - FA ~ j - ts / . • /mAerf . r ' / . itti . i . ’ bn ' ttsth O . C . / * / + e/rme/4 drJ . / & 54 1Bergbautechnik
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