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Thimble: the Pitted Iron Thimble Gilt Inside (Rouy and Berthier, Ure 1839)
Clément (User:Pleclown), Wikimedia Commons · CC BY-SA 3.0
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Thimble: the Pitted Iron Thimble Gilt Inside (Rouy and Berthier, Ure 1839)

The Paris method of Rouy and Berthier: thin sheet-iron discs, red-hot, punched step by step into a cup through five ever-deeper hollows, then turned, pitted and annealed on the lathe, gilt inside with gold leaf pressed on by a steel mandril, and banded outside with a gold fillet. Variable: closed (pitted round end) or open (no end, for tailors). Source: Andrew Ure, Dictionary of Arts, Manufactures and Mines (1839), 'Thimble'. Picture: a modern pitted thimble (Commons, CC BY-SA 3.0).
Hejuru
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Amabwiriza

1

Punch the blanks

Cut sheet iron 1/24 in thick into strips sized for the thimbles. Run them under a punch press to cut discs about 2 in across, left joined by a tail, a dozen to a strip.

Ibikoresho by'iyi ntambwe:

Ikibaho cy'icyuma (gikubiswe)Ikibaho cy'icyuma (gikubiswe)1 1/24 in

Ibikoresho bikenewe:

Imashini ikanda itoboraImashini ikanda itobora
2

Sink the cup

Heat the blanks red-hot and lay each on a mandril fitted to its size. Strike the middle with a round-faced punch about as thick as a finger to sink it into the first hollow, then drive it through a block with five hollows of increasing depth until it has the thimble's shape.

Ibikoresho bikenewe:

Iziko ryo GucuraIziko ryo Gucura
Igikoresho cyo GufataIgikoresho cyo Gufata
Icyuma kitazwiIcyuma kitazwi
InyundoInyundo
3

Turn and pit on the lathe

Chuck the rough thimble in the lathe, polish the inside, turn the outside, mark the rings for the gold band, and press in the rows of pits with a milling tool.

Ibikoresho bikenewe:

Imashini yo guhinguza icyumaImashini yo guhinguza icyuma
Igikoresho cyo gushushanya imirongo ku byumaIgikoresho cyo gushushanya imirongo ku byuma
4

Anneal, gild and band

Anneal and brighten the thimbles. Line each inside with a thin cone of gold leaf, bonded to the iron by the hard pressure of a smooth steel mandril. Turn an annular seat outside, lay a gold fillet in it and press its edges into a fine groove cut on the lathe.

Ibikoresho by'iyi ntambwe:

Urupapuro rwa zahabuUrupapuro rwa zahabu1 lining
Icyuma kitazwiIcyuma kitazwi1 gold fillet

Ibikoresho bikenewe:

Iziko ryo GucuraIziko ryo Gucura
Inkoni ya mandrelInkoni ya mandrel
Imashini yo guhinguza icyumaImashini yo guhinguza icyuma

Ibikoresho

3

Ibikoresho bikenewe

8

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