This web site features an extensive section concerning cryptography:

A Cryptographic Compendium

And here is a direct link to its index page.

Originally, I had among the pages on other topics, a single page about a map projection of my own. Now, having once again written, this time to run on a PC, a program to draw maps in a variety of projections, this site now also contains:

Map Projections

an extensive series of pages describing several map projections and how to construct them.

Note that there are some other topics addressed within the section on cryptography as well. Error-Correcting Codes have a page, and the section on teletypewriter ciphers illustrates many codes used with teletypewriters; more on this topic is at a page within the section on data compression. Particularly intriguing may be the proposal for representing a large repertoire of characters within 5-level code.

To view a wide range of other topics, go to the

from where you can go directly to pages about unit conversions, color filter array designs, signal flag systems, the musical scale, telescopes and eyepieces, pentagonal tilings, the slide rule, infinity, Archimedean solids, The Greatest Modern Board Game of Skill, computer keyboards, computer front panels, and many other topics.

For quicker loading, the section on Featured Images which addresses a number of topics for which I have created drawings, but not a full page concerning the topic as yet, has been taken off the main page. It includes an image showing the purported relation of pi and the golden ratio to the Great Pyramid, and a new item, showing a solid with faces having octagonal symmetry and other faces having pentagonal symmetry.

A brief page with a few annotations about the Girl Genius web comic, for which a link banner appears to the right, is now on this site.