Not finding anything like this online, I decided to post this manual, found among some old toys my brother Ted sent me a while back. This is so much better than the sheet they provide with modern tinkertoys.
4 page color PDF of basic manual (above)
Additional manuals with more complicated designs can be found in my posts below:
Models for the vintage "Big Boy" and "Grad" sets
photos; 4 page color PDF of "Big Boy" & "Grad" manual
If you appreciate these manuals, why not add to our "Tinkertoy Engineers' Relief Fund" (see sidebar -- sorry I can't set the minimum below $5)-- we'll post & scan new manuals as we find them! Or maybe we'll just go buy an ice cream!
And here are some YouTube movies of a"Big Boy" building project in action
Tinker Toy Jack-knife Bridge (from the Teck & Major manual)