@raprap,
HA, I use the center part of two old slide riules as a table mount to put laptops on(so they dont overheat on the base)
I found an old book of Hydrology systems that had problems associated with the sections. So I had much paper copied. 3X4, 3X5, Semi log, nomograph , and phase rule .
I saw some 7 cycle log paper, I wonder what the hell those guys were plotting?