The Collation

Research and Exploration at the Folger

Posts Tagged: Giambattista della Porta

Constructing volvelles

As Elizabeth Bruxer correctly identified within a few short hours of its posting, this month’s crocodile mystery showed the inner disc of an unconstructed volvelle from a copy of the 1591 edition of Giambattista della Porta’s De furtivis literarum  notis (STC 20118). The key to her identification lay in recognizing the image as being part of a volvelle and guessing that it was connected to ciphers.… Continue Reading