Les boussoles de mine du Museo di storia della scienza de Florence / Henri Michel.
Abstract:
The compasses that were used for making maps of certain mines in the Tyrol in the 16th century took on a particular form. The instruments are rare, and their execution boarders on the sumptuous. In fact they were used in silver mines belonging to the state, and this justified a very accurate construction. The Museum of the History of Science in Florence has two remarkable sets that deserve detailed descriptions
Annali dell'Istituto e Museo di storia della scienza di Firenze A. 2, fasc. 1 (1977), p. 27-34