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One litre of Ferrotec EFH-1 on the estate bench, a recipe to make it remember, twelve patents that tried the same tube between 1890 and 2013, and the one word in Stan's EPG chapter that decides it.

The archive's own copy, 19 September 2026 30 MB

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What was shown

Episode 13 ended on a bottle of Ferrotec EFH-1 photographed at the estate sale, and on an instruction: be the person standing next to him. Somebody was. This film takes a recipe from the archive's community for making that fluid hold a field — 20 nm Fe64Co36 spheres added to the EFH-1 at equal weight, then the mix magnetised — and works the arithmetic beside it: what changes inside a field, what the two materials do to each other, and how long a grain of each size keeps its direction in the oil. Then it asks the same three questions of every filing the archive holds that put a magnetic material in a moving loop, from Tesla in 1890 to a 2013 application, Battelle's own loop of 1972 among them, and puts them on one ladder with Stan's chapter. The builder is not named and not judged; the recipe is presented as given.

About the voice. Where you hear Stan Meyer in this film, you are hearing a synthetic voice built by a machine from thirty seconds of his voice on the Deer Creek conference tape of 1985. It reads six lines, each his own words and each cited below. The narrator is a stock voice and nobody in particular. Treat both as a reading, not a recording.

What is assumed. The record gives the fluid speed (50 in/s, the EPG #1 build sheet) and one coil (400 turns of #30, Stan's orientation coil as Max Miller recorded it). It does not give the length of a pickup coil. The film assumes one inch, says so on screen, and every time in it scales with that inch. The polynoid of EPG #3 is treated as the same coil used as a drive stage.

The numbers

Constants are episode 13's: magnetite 446 kA/m, Fe64Co36 2,019 kA/m, a 2 nm surfactant shell, 300 K, EFH-1's 6 cP. Equal weight is 4.8% magnetite and 3.1% alloy by volume; saturation 1,070 G against 470 G. Contact energies: magnetite–magnetite about 1 kT, sphere–magnetite about 14 kT, sphere–sphere about 250 kT; 12.5 magnetite per sphere by count. Brownian time in 6 cP: 31 µs for a 20 nm sphere, 0.2 ms for a 44 nm cluster; 200 nm holds for 20 ms, 760 nm for a second, 3 µm for a minute. Néel time for Fe64Co36 at K ≈ 10⁴ J/m³: 25 µs at 20 nm, 0.4 s at 25 nm. The script that draws the charts, charts.py, is beside the spec in the repository.

The shelf

Tesla, 1890 · Chilowsky, 1950 · Eaton, 1957 · Wells, 1968 · van der Voort, 1971 · Fawcett and Anno, Battelle, 1972 · Baker, 1975 · Redman, 1977 · Meyer, 1982 · Carr and Miller, 1984 · Nakamats, 2001 · Motisse, 2013.

Battelle

Fawcett and Anno's loop was filed for Battelle Development Corporation in January 1972 and again in April 1974, and granted in December 1975: freely movable, magnetically permeable bodies in a closed loop, propelled by expanding gas or a travelling magnetic field, giving up their energy through a linear generator. The Grove City Record of 21 October 1976 calls Stan "the former Battelle Memorial Institute electronics technician"; Stephen says he worked there before the water work; Stan says at Deer Creek that he took the cell before examiners "in Battelle and others". Neither family of filings cites the other, and the archive does not hold when Stan was at Battelle or what he did there. The film puts the dates side by side and leaves the question open.

Sources

Everything put on screen is listed under What was shown, in the order it came up. The transcript beside the recording is the script the voices read, with the clock on every line.

EPG ferrofluid EFH-1 Fe64Co36 Néel relaxation Brownian relaxation Redman 1977 synthetic voice