Christmas with Faraday: The Chemical History of a Candle
01.01.70
Over at Skulls in the Stars.]
Faraday was a 19th century British scientist, the son of a blacksmith, who started out as a bookbinder’s apprentice and took advantage of that position to read voraciously. His favorite subjects were the natural sciences.
Serendipitously, as his apprenticeship was ending, a friend gave him a ticket to a lecture on electrochemistry by the eminent scientist Humphrey Davey, at the Royal Institution — not a venue where the young humble-born Faraday would normally be welcomed.
Faraday was entranced, and after the lecture he asked Davy for a job. There wasn’t a position available, Davy gently told the young man, but shortly thereafter he sacked his assistant for brawling and hired Faraday in his stead.
It has famously been said that Michael Faraday was Davy’s greatest discovery; considering that Davy discovered the elements barium, strontium, sodium, potassium, calcium and magnesium, that is no mean compliment. Faraday went on to make conduct a series of seminal experiments in electromagnetism, among other contributions.
He also quickly gained recognition as an excellent public speaker. People in early Victorian England were highly interested in the latest scientific discoveries of the day. (They were also just as prone to superstition, though, and Faraday was a staunch opponent to things like table-turning, seances, and mesmerism.) Fellow naturalist William Crookes described Faraday’s lectures thusly: “All is a sparking stream of eloquence and experimental illustration.”
One of his favorite demonstrations is now a simple experiment repeated by schoolchildren everywhere. You can see magnetic field lines — what Faraday called lines of force — by sprinkling iron filings onto a sheet of paper held over a bar magnet. The filings align themselves within the magnetic field, so we can “see” the patten normally invisible to us.
Source: Scientific American (blog)