The Century of Inventions of the Marquis of Worcester / from the Original MS., with Historical and Explanatory Notes and a Biographical Memoir

by Marquis of Edward Somerset Worcester

No. XLIII.

How to vary each of these, so that ten thousand may know them, and yet keep the understanding part from any but their correspondent.

NOTE.

This may be effected by changing the order of their arrangement, which can only be ascertained by a previous examination of a key chosen for that purpose.