Here is a good one for any tinkerer:
Dover Books has republished a 19th-century volume titled 507 Mechanical Movements, which contains pages of mechanism diagrams and a description of what each mechanism does.
For example, no. 200 (top right corner):
A mode of obtaining two different speeds on the same shaft from one-driving wheel.
A regular vibrating movement of the curved slotted arm gives a variable vibration to to the straight arm.
You can get your own copy from Amazon.
Found at the The Athanasius Kircher Society via the Make Blog
I found a nice three column layout based purely on CSS here and though it would be nice to convert to a s9y theme.
From the original site:
Everything in EM (change your browser font size to see the effect)
Full height columns (or any column can be longest)
Switch between one two or three columns
Fluid center but fixed width side-columns
Min-max width for IE (experimental)
Just a "QuickBlog" entry to throw up a picture of the differential adder/subtractor drive I'm using for rtlToronto20 "Projecy Y" competition in March...