An envelope is shown and placed in full view. As many as five members of the audience are asked to give numbers consisting of as many digits as wished. As each spectator gives a number they watch as the number is written on the pad.

You now have a column of numbers that when totaled will be in the thousands. The pad is handed to another spectator who totals the column of figures which no one could have possibly foreseen the answer since the numbers had only been thought of.

The total is announced and anyone is asked to open the envelope which was on display before any thing was done. Inside the envelope is a prediction which matches the total exactly!

This is a self contained mechanical marvel, absolutely ingenious and defies detection. This is a stamped piece and from Amsterdam. Includes illustrated instructions in English with several ideas and routines for use. Condition very fine and scarce.