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By These Hands, the Light of Science (この () () (がく) () Kono Te ni Kagaku no Hiwo) is the twenty-fifth chapter of the Dr. Stone manga.

Summary

Atop the bald mountain, Kohaku has set up the makeshift lightning rod (made of Kinro's golden spear) just in time for it to be struck by lightning. Gen is struggling to come to terms with the magnitude of the accomplishment they are pursuing with no setbacks.

Senku retrieves the iron rod and proclaims that electricity is on it's way. The group gathers at the summit as the clouds disperse giving way to rays of sunlight. Kinro is devastated seeing that his precious golden spear has been mostly disintegrated by the current. Kohaku apologizes for it, while Ginro takes the chance to tease him about it, and gets a few dents put on his head.

Kohaku decides to try out the magnets, and gets exhaltated when they refuse to stick together, being pushed apart by a mysterious force. Senku corrects her about having the poles the wrong way around, and they snap together. They succeeded in making magnets.

Chrome is excited to make electricity, Gen snarkily inquires about what will power the generator, would it be fuel?, wind? perhaps even nuclear power?; turns out it's muscle power.

They cast copper disks that they hammer down into thin, large copper sheets. The sheets are cut into large copper disks, mounted on an axle, and their edges are ground smooth using corundum, by Suika and Kohaku.

Senku coats copper wires with lacquer, explaining what he's doing to Gen, who finally gives up and asks him why his face has been swelt all this time. Lacquer poisoning, Senku says.

By night time, their dual hand-cranked dynamo is complete. Chrome finds it so flimsy he remarks that they need two people to spin it in sync or it will shake itself apart. Trying to think of good candidates for the job, their minds land on Ginro and Kinro. Gen steps in and ultimately buys them with a lie about how it's possible to use electricity to make and repair gold and silver spears. Kinro was more reluctand but gave in never the less. This move was questioned by Senku and Kohaku, the former questioning him about whether he's aware of the shortcomings of electroplating, Gen just made everything up.

The brothers pour their hearts spinning the dynamo, and Senku is very pleased with how his Kingdom of Science grows. Not seeing any result of their work, Gen wonders if they'll really get electricity out of it. He is presented with a carbonized bamboo fiber before Senku and Chrome climb atop the shed with cables. Gen doesn't get what is going on, until Senku connects the fiber across the wires.

A realization came rushing back to Gen's mind. Japanese bamboo made the filament of Edison's light bulb. Atop the shed, Senku asks Chrome if he's afraid of the dark, he says that he logically is, and asks why this question. He explains that back in his age, there was no darkness to be afraid of, the 24 hours of the day were conquered by Edison's electric light.

As the connection is made, the kingdom of science is bathed in a bright white light, lasting for a brief but intense moment, after thousands of years.

As everyone winds down from this event, Gen reflects on what this means for his allegiance to Tsukasa. Senku tells Chrome about his childhood, and how the first biography he ever read was of Thomas Edison, leading him down a path of fascination with electricity. After waking up bare naked in the wild, he is overjoyed to have it back, and so is Chrome.

Characters in Order of Appearance

Chapter Notes

  • Then kingdom of science succeeds in making magnets with lightning.
    • Magnets have a polarity and their relative orientation determines if two magnets attract or repel.
    • They can be used to craft dynamos/generators.
  • Senku has a strong allergic reaction to lacquer.
  • A dynamo is crafted by the kingdom of science, which is hand granked by Kinro and Ginro. Electricity acquired !
    • The brothers join the Kingdom of Science.
  • While possible to electroplate spears with gold and silver, it's not an easy process.
  • Carbonized bamboo was the filament of Edison's lightbulb. They lit one up in the open air and it burnt away quickly.
  • Chrome is afraid of the dark.
  • Senku read Edison's biography as a boy in school.

Trivia

  • In the cover page, Senku is holding a staff that has a primitive electric motor in it.
  • Although Kohaku untied her hair in order to use the rope to attach the iron rod to the spear in the previous chapter, as she is landing from her jump at the start of this chapter, her hair is tied again while the rod is still tied to the spear.
  • Kurita Ryoukan from Eyeshield 21 makes a cameo as Senku admits the dynamo will be muscle powered.
  • The dynamo they made is a set of two greatly oversized Faraday disks wired in series. The Faraday disk is a homopolar generator that produces low voltage DC. Although simple in construction, it's highly inefficient, and without large modifications, was never a practical power source, which has also been verified by scale models built by fans[1].
  • The panel in which the flow of electricity through the cables of the generator is shown, shows the flow coming out of the negative side and into the positive side. This is consistent with electron flow, and not with conventional current as it's conceptualized and measured in electrical or electronics engineering[2].
  • The breakthrough that was Edison's bamboo filament bulb that made it vastly superior to its predecessors was its high electrical resistance, making a poor choice to run on a low voltage generator, as little current would flow.

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Chapters and Volumes
Volume 1 1234567Extras
Volume 2 89101112131416Extras
Volume 3 17181519202122232425Extras
Volume 4 262728293031323334Extras
Volume 5 353637383940414243Extras
Volume 6 444546474849505152Extras
Volume 7 535455565758596061Extras
Volume 8 626364656667686970Extras
Volume 9 717273747576777879Extras
Volume 10 808182838485868788Extras
Volume 11 899091929394959697Extras
Volume 12 9899100101102103104105106Extras
Volume 13 107108109110111112113114115Extras
Volume 14 116117118119120121122123124Extras
Volume 15 125126127128129130131132133Extras
Volume 16 134135136137138139140141142Extras
Volume 17 143144145146147148149150151Extras
Volume 18 152153154155156157158159160
Volume 19 161162163164165166167168169
Volume 20 170171172173174175176177178
Volume 21 179180181182183184185186187
Volume 22 188189190191192193194195196
Chapters not yet in tankōbon format 197198199200201202203204205206207208209210211212213214
[v  e]
Story Arcs
Prologue Saga
Stone Formula Arc
Chapters 1234
Episodes 12
Vs. Tsukasa Arc
Chapters 56789101112
Episodes 345
Ishigami Village Saga
Kingdom of Science Arc
Chapters 131415161718192021222324252627282930313233
Episodes 5678910111213
Village Games Arc
Chapters 34353637383940
Episodes 131415
Village Origins Arc
Chapters 4142434445
Episodes 1617
Stone Wars Saga
Vs. Hyoga Arc
Chapters 4647484950
Episodes 1819
Communications Arc
Chapters 5152535455565758596061626364656667686970717273747576777879808182
Episodes 20212223242526272829303132333435
Source of the Petrification Saga
Age of Exploration Arc
Chapters 8384858687888990919293949596979899 100
Episodes 35
Treasure Island Arc
Chapters 101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138
Episodes
The Truth of the Petrification Saga
New America City Arc
Chapters 139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169
Episodes
South America Arc
Chapters 170171172173174175176177178179180181182183184185186187188189190191192193
Episodes
New Stone World Arc
Chapters 194195196197198199200
Episodes
Globetrotting Arc
Chapters 201202203204205206207208209210211212
Episodes
Stone to Space Saga
  1. Sammzor's replica generator on Youtube
  2. Difference between conventional current and electrion flow at electricaltechnology.org
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