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

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

Drilled 3/4-inch steel ball with an approximately 2

this 2mm-plug lead pairs a banana plug at one end with a crocodile clip at the other for fine-pitch experimental work

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.