Before the short strake and the jigging - sieve had been invented , metallifer ous ores , especially tin , were crushed dry with stamps and washed in a large trough hollowed out of one or two tree trunks ; and at the head of this trough was a platform , on which the ore was thrown after being… … A — Trough . B — Platform . C — Wooden scrubber . The short strake is narrow in the upper part where the water flows down into it through the little launder ; in fact it is only two feet wide ; at the lower end it is wider , being three feet and as many palms . At the sides , which are six feet…
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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_000033125008455038-332-228.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_000033125008455038-265-180.webp)
![An illustration from Cosmographey oder beschreibung aller Länder/ Herrschafften/ fürnem[m]sten Stetten/ geschichten/ gebreüchen/ handtierungen, [et]c. (1574)](https://img.insideoutlibrary.com/img/200/heidelberg-muenster1574-659-1.webp)
