Set of 24 touch needles. (Basle, 1556). Woodcut
A set of 24 touch needles. These were made of the purest obtainable gold and each was alloyed with different known amounts of silver and copper, or of both. The sample of gold to be tested was rubbed on a hard dark stone, and the colour and thickness of the trace left was matched by one of the touch needs and the value of the sample obtained. From De re metallica, by Agricola, pseudonym of Georg Bauer (Basle, 1556). Woodcut
Picture No
13901269
Media ID
48421359
Size
2808px x 2068px
(870KB)
Credit
World History Archive / Mary Evans Picture Library
Source
World History Archive





























