In 1854, photography was barely fifteen years old and already drowning in competing techniques. Daguerreotypes, calotypes, collodion plates, waxed paper negatives, albumen-on-glass — each had evangelists, each promised better pictures. Into this confusion stepped Charles A. Long, a London photographer who published a slim shilling pamphlet through the optician Bland & Long of Fleet Street. His thesis was startling for its time and oddly relevant for ours.

"It is a generally admitted fact, that those Photographers who are content to follow some good process to the exclusion of others that have been but imperfectly tried, produce by far the best pictures with the least expenditure of time and trouble."

This is, essentially, the deep-work argument 170 years before Cal Newport. Long had watched a generation of hobbyists fail by dabbling — coating plates with collodion on Monday, switching to waxed paper on Tuesday, abandoning both for albumen on Wednesday — and concluded that technique-hopping was the enemy of competence.

The forgotten knowledge embedded here is twofold. First, the recipes themselves. Long's book promised "simple directions" for:

• The albumenized glass process — coating panes of glass with whipped egg whites to fix a photographic image
• The collodion process — pouring a nitrocellulose-and-ether solution onto plates while still wet
• The calotype — Fox Talbot's paper-negative method
• The waxed paper process — Le Gray's method of saturating paper with wax to make it translucent enough to print through

Some photographers still practice these as fine-art revivals, but the working knowledge — how warm the egg should be, how to avoid air bubbles, when to stop the silver bath — was largely lost when gelatin dry plates arrived in the 1870s and made the whole apothecary's bench obsolete.

The second piece of forgotten wisdom is the meta-lesson. Long was making a claim about how skill accumulates: that mastery compounds within a single discipline, and that the appearance of optionality (so many processes! so many choices!) is actually a tax on competence. He wrote that omitting variations "will be found a convenience rather than the reverse to the beginner."

Modern readers will recognize this immediately. It is the same advice given to programmers who jump between JavaScript frameworks every six months, to writers who can't decide between Scrivener and Notion and Obsidian, to home cooks who own seventeen knives and can use none of them well. Long's 1854 shilling manual diagnosed a problem that the infinite-choice internet has only amplified: the people who produce the best work pick a process and stay with it long enough to actually learn its quiet edges.

That a Fleet Street optician's pamphlet about coating glass with egg whites contains a more honest productivity principle than most modern self-help books is, perhaps, the most surprising part of all.