Classically Trained Slide Rule (Slipstick) Mechanical Analog Calculator. Graphic of a Slide Rule with the phrase Classically Trained. Great nostalgic gift for retired engineer, math teacher, scientist, college professor from the boomer & silent generations Old Fashioned Slide Rule. Vintage Analog Calculator Design. Reminder of the time when physicists, engineers, scientists, and professors used slipsticks to calculate logarithms. This throwback is sure to bring back memories at your next college reunion! Crafted from a unique 40 singles tri-blend fabric, offering a lightweight, ultra-soft feel Classic crew neck design with side-seam construction ensures both comfort and a flattering silhouette Lighter colors are semi-sheer