Interchangeable Dial for Demonstration Meter, Model B Graduations_50mL replacing the dry-cell stack on

replacing the dry-cell stack on student-circuit benches

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

3 inches with cork-lined jaws

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

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

Interchangeable Dial for Demonstration Meter, Model B Graduations_50mL replacing the dry-cell stack onUsed 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.