Vintage 1960's WEATHERCASTER Slide Rule with EVINRUDE Outboard Motor Advertising. Irving P. Krick (pat. pending). This is a wonderful, brilliant tool for using old technology to calculate and display data to calculate weather. This instrument contains all of the data necessary to predict weather in a simple. 5 step procedure! The Weathercaster comes complete with all original items including the original bstorage box. Weathercaster slide rule measures 10" x 1-1/2" inches in size. Near mint condition.