Plaintext file of An English translation by Barbara Foxley from 1911 on Project Gutenberg: www.gutenberg.org/cache/epub/5427/pg5427.txt which is in the Public domain in the United States.
Can't find a French txt, fr.wikisource.org/wiki/Émile,_ou_De_l’éducation/Édition_1782 has a PDF though.
Front cover of the first edition of Emile, or On Education.
Source. Good summary on the defunct Encyclopedia Britannica: www.britannica.com/topic/Emile-or-On-EducationAlso:
it is not specifically about schooling but about the upbringing of a rich man’s son, Émile, by a tutor who is given unlimited authority over him. Rousseau’s aim throughout Émile is to show how a natural education, unlike the artificial and formal education of society, enables Émile to become social, moral, and rational while remaining true to his original nature
He learns a trade, among other things. He studies science, not by receiving instruction in its facts but by making the instruments necessary to solve scientific problems of a practical sort.
Book 1:Source:
I do not consider these laughable establishments called Colleges as a public institution.There are in several schools, and especially in the University of Paris, Professors whom I like, whom I esteem very much, and whom I believe very capable of instructing young people well, if they were not forced to follow established usage. I urge one of them to publish the reform project he designed. We will perhaps finally be tempted to cure the illness by seeing that it is not without a remedy.
Je n’envisage pas comme une institution publique ces risibles établissements qu’on appelle CollegesIl y a dans plusieurs écoles, & surtout dans l’Université de Paris, des Professeurs que j’aime, que j’estime beaucoup, & que je crois très capables de bien instruire la jeunesse, s’ils n’étoient forcés de suivre l’usage établi. J’exhorte l’un d’entre eux à publier le projet de réforme qu’il a conçu. L’on sera peut-être enfin tenté de guérir le mal en voyant qu’il n’est pas sans remède.
Possible to publish pages: www.notion.so/help/public-pages-and-web-publishing
But non-paid plan currently disables "Search engine indexing" of that sharing, so it's useless. There's an "Allow duplicate as template" button though which is nice.
URLs are horrendous however, e.g.: lofty-flower-be4.notion.site/aa-2274c59a06124d5b974b781a67340670 Only the
aa in that came from us. They don't even have the guts for a fixed subdomain.Also it does not work without JavaScript, no SSR, everything is dynamic.
They don't show multiple input pages on the same render, e.g.: lofty-flower-be4.notion.site/aa-2274c59a06124d5b974b781a67340670 does not contain the child lofty-flower-be4.notion.site/bb-45df7212a2e14e04b3f9604035c7acf4 as already implemented on OurBigBook Web Dynamic Article Tree.
Cross page links to work fine. But you don't link to explicit IDs, only internal hidden IDs. This can be even slightly confusing to users as multiple identical options can show up when you start creating a link. They do try to disambiguate with the parent page however.
So this is a reasonable single-person publishing platform for your notes.
Someone made and sold a helper for it:
Found them through: commons.wikimedia.org/wiki/File:Emissions_Spectra.webm Epic.
It emits a very narrow range of frequencies (small linewidth), which for many purposes can be considered a single frequency.
It does however have a small range of frequencies. The smaller the range, the better the laser quality.
Laser linewidth - measurement and explanation by Your Favourite TA
. Source. 
The key advantages of lasers over other light sources are:
- lasers emit a narrow spectrum
- it can be efficient collimated, while still emitting a lot of output power: Section "Why can't you collimate incoherent light as well as a laser?"
- can be phase and polarization coherent, though it is not always the case? TODO.
One cool thing about lasers is that they rely on one specific atomic energy level transition to produce light. This is why they are able to to be so monchromatic. Compare this to:As such, lasers manage to largely overcome "temperature distribution-like" effects that create wider wave spectrum
- incandescent bulbs: wide black-body radiation spectrum
- LED: has a wider spectrum fundamentally related to an energy distribution, related: Why aren't LEDs monochromatic
- TODO think a bit about fluorescent lamps. These also rely on atomic energy transitions, but many of them are present at once, which makes the spectrum very noisy. But would individual lines be very narrow?
Spectrum of laser light by Shaoul Ezekiel
. Source. 2008, MIT. Unlisted articles are being shown, click here to show only listed articles.