Griffin - London - Gramme - Electrostatic Measurements. The photos show how it works, if you come close to a charged object, the 2 gold strips will push away from each other. The item "Electroscope Electrostatic Measurements.Griffin London" is in sale since Monday, November 30, 2020. This item is in the category "Antiques\Science/Medicine\Scientific Instruments". The seller is "dirk294" and is located in MECHELEN. This item can be shipped worldwide.