lbarrows , planks joined together are laid upon the sills ; if the rock is hauled out in trucks , then two timbers three - quarters of a foot thick and wide are laid on the sills , and , where they join , these are usually hollowed out so that in the hollow , as in a road , the iron pin of the… … A — Posts . B — Caps . C — Sills . D — Doors . E — Lagging . F — Drains . Miners timber drifts in the same way as tunnels . These do not , however , require sill - pieces , or drains ; for the broken rock is not hauled very far , nor does the water have far to flow . If the vein above is metal -…
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![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-87-46.webp)
![An illustration from Georgii Agricolae De re metallica : libri XII. Quibus officia, instrumenta, machinae, ac omnia deni[que] ad metallicam spectantia, non modo luculentissimè describuntur, sed & per effigies, suis locis infertas, adiunctis latinis, germanicis [que] appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. ; Eiusdem De animantibus subterraneis liber, (1556)](https://img.insideoutlibrary.com/img/200/ia-gri_000033125008455038-59-30.webp)