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This article originally appeared in Antique Trader magazine Learn about subscribing to Antique Trader magazine for just

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This article originally appeared in Antique Trader magazine Learn about subscribing to Antique Trader magazine for just $1 per issue!

per issue!

dating antique furniture-88

Note the flat spot on the shaft, the irregular threads, blunt tip and the off center slot.

The screw in the center is machine made around 1830.

They were seldom attempted in quantity much before the William and Mary era, but the sophistication of that period required the use of more screws so the process became more widespread.

Handmade screws of the 18th century started out much as the handmade nails of the period did, as square iron nail stock produced in a rolling mill.

Screws with these characteristics were produced until early in the 19th century.

Around 1812 a machine was introduced that made screws on a lathe but the War of 1812 slowed its distribution and development.

In effect a screw is a ramp wrapped around a column.

But how to manufacture that ramp on that column by hand?

The same was true for hinges used under a table leaf. Archimedes, the Greek scholar and mathematician of the third century B.

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