Interchangeable Dial for Demonstration Meter, Model H Health & Genetics_Equipment & Supplies letting students read image height

letting students read image height and position directly off the projected real image during focal-length investigations

sized to fit tight laboratory frames while carrying heavy loads

this six-lens glass set covers double convex

Parallelogram-of-forces apparatus on a 26 by 20 inch wall-mountable board with two clamp-on pulleys

Interchangeable Dial for Demonstration Meter, Model H Health & Genetics_Equipment & Supplies letting students read image heightFive hundred milliamp DC scale on a 315x115mm laminated panel with sealed shunt, sized to reconfigure the demonstration meter as a 0 500mA ammeter for general purpose student bench work.