123

Singing. Woodcut from Prasberg, Clarissima plane atque choralis musicae 
       Interpretatio, Basel, 1507.
Piano, from Minguet, Reglas y Advertencias generales, 1752.
Chorus. Title-page from Gafurius, Practica masicae utriusque cantus,
       Venice, 1512.
Strings. Drei Geiger, from Jost Amman.

Technology Study [No. 709].

     The window decorations, mining:

Two plates from Agricola, De re metallica, Basileæ, 1556.

Technology Seminar [No. 710] .

     The window decorations:

Building, Legend des Heiligen Keyser Heinrichs, Bamberg, 1511.
Waterwheel, from Vitruvius, De Architectura, Venice, 1567.
Tubal Cain, from the Nuremberg Chronicle.