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/edu/ - Education

'The weapon of criticism cannot, of course, replace criticism of the weapon, material force must be overthrown by material force; but theory also becomes a material force as soon as it has gripped the masses.' - Karl Marx
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What would you introduce? Personally, I would build a spark gap transmitter. That was possible with Roman tech. The first pic is the transmitter.

Steam engine (left)
>Brass boiler with pipes, valves, and a flywheel
>Generates mechanical rotational energy from steam
>Drives the belt system via a crank

Belt-driven generator (center)
>Large vertical rollers/drums with a rough hemp or linen belt running over them
>Belt friction against the rollers or pads generates static electricity (triboelectric effect)
>The bottom drum is connected mechanically to the steam engine flywheel
>Tensioning rod/axle keeps belt tight

Metal combs / contacts
>Positioned near the moving belt (small brass posts)
>Collect static charge from the belt without touching it
>Feed charge to the Leyden jar

Leyden jar (right)
>Glass jar with a metal cap and rod
>Stores the high-voltage static charge
>Connected to a spark gap (two small posts where you see the blue arc)

Spark gap
>Two brass posts next to the Leyden jar
>Where the arc jumps when voltage is high enough
>Arc is directed toward a metal antenna rod (or just floating if for demonstration)

Antenna / terminal
>Metal rod sticking out from spark gap
>Radiates electromagnetic waves during the spark
>Bundles of raw hemp or linen fibers
>Used to make the belt and also likely for weaving/looms
>Shows the dual-purpose of Roman tech: textile + electricity

Receiver in the second pic. Uses Galena crystal and lodestone headphones.

So the telegraph key you flip like a switch and static will come out the layden jar?


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