Drop box (weaving device)
In weaving, a drop box or dropbox is a housing for a shuttle, invented in 1759 or 1760 by Robert Kay (1727-1802) in Bury, Lancashire. The box sits beside a loom and allows one to rapidly switch between two shuttles with bobbins, usually of different colors, making it easier and quicker to weave multiple colors for figured fabrics or striped wefts without stopping to manually change shuttles.
Source: Wikipedia
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