It's a topological
question: when the needle passes the tissue below, it carries the wire in the
loop. On the other side there is a system that puts the wire of the second
spool (the little one in the machine) in this loop, then the needle rises,
taking with it the second wire.
In this way a series of
knots are formed along the seam between the spool higher, the big one, and the
lower, the small one.
The first practical and
widely used sewing machine was invented by Barthélemy Thimonnier, a French
tailor, in 1829.
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