Which Quincunx Should I Buy? 

Our various models have evolved over the years from the original Model WD-4 to the current Model WD-7 Quincunx. About 95% of all quincunx sales now are the Model WD-7 because it not only incorporates the three gates so you can view multiple distributions at one time, but it also has the adjustable pin block which makes four different distributions. 

The different distributions allows you to demonstrate variability reduction, a critical aspect to process improvement. 

Where did the name Lightning Calculator come from? 

The original quincunx was invented by Galton in 1873. When the Model WD-4 Quincunx was first invented for industrial use electronic calculators had not been invented yet.  There were however large mechanical calculators being used in industry at the time called "Lightning Calculators". 

Well you guessed it, it was named after this calculator because it could quickly demonstrate concepts. We occasionally get questions from antique dealers who find these devices to ask if there is any connection with our company. The only connection is that the original inventor copied the name. Since the name has been associated with quincunx boards over the years we still call ourselves "Lightning Calculator".