Interchangeable Dial for Demonstration Meter, Model B Graduations_50mL used to route current down

used to route current down one of two alternative branches in series-parallel circuit investigations

Used to visualize amino acids

Simple-form Boyle's Law apparatus pairing a graduated plastic syringe on a wooden block with a weighted piston

equipping a class for compound-pulley and multi-rope mechanical-advantage experiments

Optically-worked glass double convex lens with a 150mm focal length and 1

Interchangeable Dial for Demonstration Meter, Model B Graduations_50mL used to route current downUsed to reconfigure the demonstration meter as a different ammeter or voltmeter, this interchangeable dial carries an integrated shunt or voltage multiplier sealed in its laminated panel.