Description

Higher-range 30-0-30mA center-zero galvanometer at 20mA sensitivity and plus-or-minus 2

configured to make and break a circuit at the rhythm of a Morse-code transmission for telegraph-history demonstrations

and ad-hoc experimental setups

and a central control module

Neck outer diameter: 33

Wood and Metal Cylinder for Thermal Demonstration Racks & Stands_Test Tube Racks Higher-range 30-0-30mA center-zero galvanometer atHalf wood half metal 200 by 30mm cylinder demonstrating thermal conductivity differences through a wrapped paper that scorches over wood but stays uncharred over metal in flame.

Exchange/Return Notes

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Wood and Metal Cylinder for Thermal Demonstration Racks & Stands_Test Tube Racks Higher-range 30-0-30mA center-zero galvanometer at

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