1832 · Michael Faraday
Experimental Researches in Electricity, First Series
What this work is
The first series of Faraday's Experimental Researches in Electricity, from 1831. He reports that pushing a magnet into a coil of wire swings a galvanometer needle one way, and pulling it out swings it the other. With a copper disk spinning between magnet poles he kept the needle steadily deflected. He calls this induction and uses it to explain Arago's spinning-magnet effect.
Then and now
Faraday showed that a moving magnet swings a needle wired to a nearby coil. Physics built field theory on his lines of force and treats fields filling empty space as real. His needles swung, and nobody has seen a field.
Verdict
SCIENTIFIC
The work follows the scientific method, and the paradigm it assumes passes. Both layers must pass. The verdict is scientific.
1·This work · inside the paradigm
SCIENTIFIC
Follows the scientific method within Classical Electromagnetism (Experimental Electricity).
2·Paradigm · Classical Electromagnetism (Experimental Electricity)
SCIENTIFIC
Passes all three tests.
How the verdict is decided
The verdict grades both layers: the paradigm this work assumes, and how the work was carried out inside it. Both must be scientific for the whole thing to be scientific. A clean method inside an unscientific paradigm is unscientific. An unscientific method inside a better paradigm is unscientific. A split on either layer is mixed. The worse layer decides.
1·This work
Did this work test its claim with methods that are independent, falsifiable, and non-circular?
SCIENTIFIC
This work claims that pushing a magnet into a coil of wire generates an electric current in the wire, that reversing the motion reverses the current, and that this explains Arago's magnet phenomena. All three tests pass.
Independently Verifiable
Pass
The recorded observation is a needle swinging on a dial, and watching a needle move requires no theory of electricity.
Falsifiable
Pass
Faraday printed experiment after experiment where the needle did not move, so a magnet that never moved a needle would have killed the claim on his own pages.
Non-Circular
Pass
The battery, the coils, and the borrowed magnet were built for other jobs, and moving the magnet outside the coil acted as a control that produced nothing.
Why
Every claim rests on which way a needle swung and when, which anyone at the bench could watch. He printed runs where the needle did not move, so a magnet that never moved it would have killed the claim. The battery, coils, and magnet were made for other work, and moving the magnet outside the coil was a control that produced nothing.
2·Paradigm · Classical Electromagnetism (Experimental Electricity)
Does the framework this work assumes pass the three tests?
SCIENTIFIC
Independently Verifiable
Pass
A current in this framework is something a needle answers, a spark shows, and chemical action at a wire tip confirms, all visible to a stranger.
Falsifiable
Pass
The framework's claims live or die by whether needles swing, iron jumps, and filings line up, and those events either happen in front of witnesses or they do not.
Non-Circular
Pass
The needles, batteries, and magnets that test electricity were not manufactured from the claim that magnets induce currents; each was in use for other work before this paper.
Why
The framework this work runs on is experimental electricity: batteries, wires, magnets, and needles. Its working entities end in visible events rather than in a reading that only a theory can assign. A current shows up as a swinging needle, a spark, or chemical decomposition at a wire's end. Magnetism shows up as iron jumping to a pole and filings settling into the patterns Faraday traced as his magnetic curves. None of the instruments came out of the induction claim being tested: the battery already existed, the great magnet belonged to Dr. Knight and sat at Woolwich, and the galvanometer was already the standard reader of currents. When Faraday reached past all this and named an electro-tonic state inside the wire, he called it probable, reserved the branch of inquiry, and did not rest his results on it. The results stand on the needles.
From the work
One of these helices was connected with a galvanometer, the other with a voltaic battery of ten pairs of plates four inches square, with double coppers and well charged ; yet not the slightest sensible deflection of the galvanometer needle could be observed.
All care was taken to guard against any direct action of the inducing magnet upon the galvanometer, and it was found that by moving the magnet in the same direction, and to the same degree on the outside of the helix, no effect on the needle was produced.
When the magnet is introduced, the needle at the galvanometer is deflected in a certain direction ; but being in, whether it be pushed quite through or withdrawn, the needle is deflected in a direction the reverse of that previously produced.