Denver Slipstick [TL4+2]
Description: a precisely calibrated and etched aluminum slide rule, with a reversible slide and T-bar. The slide is actually doubly reversible; turning the slide over deosil, widdershins, and then deosil again will reveal a new set of markings that glow faintly blue and seem to be derived from alchemical symbols and other medieval occult markings. Needless to say, the Denver Slipstick registers as magical on standard scans.
Use: Aside from the usual benefits of having a slide rule, use of the Denver gives a +1 to all Thaumatology or Ritual Magic rolls (no defaults!).