Crookes Radiometer, 2.75" (70mm) Diameter, on Plastic Base Subcategory_Racks and Stands dimensioned as the matched replacement

dimensioned as the matched replacement carriage for the LED ray box (PH0602ALED) track when an original rider is lost or damaged

NPN transistor in a protective enclosure with labeled base

the smallest in the bar-magnet series

this wooden block-and-tackle apparatus lets students count supporting strands and measure how each added pulley reduces effort

Crookes Radiometer, 2.75" (70mm) Diameter, on Plastic Base Subcategory_Racks and Stands dimensioned as the matched replacementEvacuated 2. 75 inch glass bulb on a plastic base with black and white vanes that spin under light exposure, the classic demonstration of differential radiant heat absorption.