The Numerical Mind Reader is a sophisticated take on the classic BINARY puzzle, often referred to as magic age cards or "guess the number" puzzles. Instead of merely choosing a set of cards on which a person's age appears, the Numerical Mind Reader, has the "victim" go through several machinations with cards of various window patterns cut in them, until the correct number is the only one left appearing through the stack of windows. Martin Gardner refers to this trick as "window cards," and has a section on them in Chapter 6 of his classic, Mathematics Magic and Mystery.
This particular version of the "window cards" advertises Cresota Flour and its Northwestern Consolidated Milling Company from Minneapolis. As indicated on the instruction card, the Window Card patent was issued in 1904, and patents expire after twenty years, so this puzzle is likely approaching 100 years old. Still, it is in PRISTINE condition!
I will ship within the US at the lowest ground advantage (new terminology
replacing "first class") package rate for around $5.25 (Regrettably, the package will be too thick to ship as a letter.), or if preferred, at
insured priority mail pricing
(likely from between
$10.20 and $12.55, depending on postal code). I am happy
to ship
internationally at cost --- typically around $17.10 for a small item like
this --- but I cannot always guarantee that overseas
packages can be insured or tracked.
Thank you for viewing my auction!