Electrometer
Videos
An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical handmade mechanical instruments to
Kolbe electrometer, precision form of gold-leaf instrument. This has a light pivoted aluminum vane hanging next to a vertical metal plate. When charged the vane is repelled by the plate and hangs at an angle.
Lord Kelvin's Quadrant Electrometer
Francis Ronalds
Videos
Sir Francis Ronalds was an English scientist and inventor, sometimes described as the first electrical engineer. He was knighted for creating the first working electric telegraph over a substantial di
Electrometer
…glass rod. The number of degrees twisted to bring the balls back together is in exact proportion of the amount of charge of the ball of the carrier rod. Francis Ronalds, the inaugural Director of the Kew Observatory, made important improvements to the Coulomb torsion balance around 1844 and the modified instrument was…
Ronalds, c. 1870
Elements of the subterranean electric telegraph built by Francis Ronalds in 1816
The first successful camera for making continuous recordings of scientific instruments, built by Francis Ronalds in 1845. This example is an electrograph measuring atmospheric electricity