Rillieux chained vacuum chambers to reuse steam in sugar refining
Norbert Rillieux's multiple-effect evaporator chained vacuum chambers so each stage's vapor boiled the next, cutting fuel and eliminating manual ladling.
Lire le casgenius.wikiUNE ARCHIVE CASESTUDIES.CHAT
De bons problèmes.
Des solutions brillantes.
Des idées ingénieuses face aux difficultés. Découvrez pourquoi elles ont fonctionné.
Toutes les archives, dans l’appEn l’absence de traduction, les fiches renvoient au texte original publié et conservent sa langue.
Cas publiés
3,236 CAS PUBLIÉS · MIS À JOUR RÉGULIÈREMENTRobeson and Birchfield delayed money pack trigger until robber left
Two Atlanta inventors delayed money pack activation until the robber left the building.
Lire le casNavy codebreakers faked a water shortage to confirm Midway
US Navy codebreakers faked a Midway water shortage to confirm the target 'AF' before committing the Pacific fleet.
Lire le casRoom 40 revealed Zimmermann Telegram via Mexico copy
Britain revealed the Zimmermann Telegram to America using a duplicate obtained from Mexico's commercial cable, hiding that they had broken German codes.
Lire le casRoss Gear advertised trucks, not gears, to reach all buyers
Ross Gear advertised trucks generally, not its steering gears, to reach manufacturers, dealers, and buyers at once, boosting adoption.
Lire le casRossel Island shell money built interest into ranked units
Rossel Island's shell money ranked units so debts repaid one rank higher per time, embedding compound interest without arithmetic.
Lire le casRounders' bouncers caught fake IDs by quizzing holders on hometown trivia
Rounders' bouncers stopped inspecting fake IDs and started asking holders hometown trivia, catching fakes and borrowed IDs.
Lire le casHill fixed Britain's mail by charging the sender
Rowland Hill fixed Britain's mail by charging the sender a flat penny upfront, using the first adhesive stamp, so refusal couldn't dodge payment.
Lire le casSan Francisco revived purok clubs to cut disaster warning last mile
San Francisco revived dormant purok units for house-to-house warnings, achieving zero casualties in Typhoon Haiyan.
Lire le casSanku fortified village flour by hiding the cost in bag sales
Sanku bolted an IoT dosifier onto small Tanzanian mills and paid for premix from the margin on flour bags, so fortifying cost millers nothing.
Lire le casCongress multiplied capital for small firms via private investors
Congress passed the 1958 SBIC Act, lending to private firms instead of picking startups, multiplying capital for small businesses.
Lire le casScipio Africanus stopped Hannibal's elephants by opening lanes, not building walls
Scipio Africanus, facing Hannibal's elephants at Zama, opened lanes in his formation so they ran through harmlessly, not building a stronger wall.
Lire le casGuardian gave itself an owner who couldn't die
Death duties threatened the Guardian, so John Scott put it in a trust that can't die.
Lire le casSears sold houses like catalog goods, shipping pre-cut kits
Sears sold houses like catalog goods: pre-cut, labeled kits shipped by rail, so buyers assembled them without pros.
Lire le casSEC let insiders trade by locking in plans before they knew
The SEC let insiders trade by making them commit to a written plan before they knew anything material.
Lire le casSellers standardized screw threads by getting big buyers to demand them
William Sellers got the Army, Navy, and railroads to specify his screw thread, forcing suppliers to adopt it.
Lire le casSeva Mandir cut teacher absence with student-taken timestamped photos
Seva Mandir cut teacher absence by paying per verified day, using student-taken timestamped photos.
Lire le casShah Abbas gave silk trade to relocated Armenians to avoid a rival
Shah Abbas I relocated Armenian merchants to New Julfa, giving them the silk trade because their outsider status prevented them from becoming a domestic rival.
Lire le casShannon Airport invented duty-free to survive jets
When jets threatened Shannon's refueling stop, Brendan O'Regan created duty-free shopping to give travelers a new reason to land.
Lire le casShuangtong Plastics fired Walmart and Dollar Tree to sell to small buyers
Shuangtong Plastics' Lou Zhongping fired Walmart and Dollar Tree and sold to thousands of small buyers via Alibaba, lifting margins from near zero to 20%.
Lire le cas