Water as a computer, invented twice: Phillips's MONIAC and Lukyanov's Soviet integrator

Claim 1. Bill Phillips built the MONIAC prototype in his landlady's Croydon garage in 1949 for about £400, "scrounging materials... including bits and pieces of war surplus parts from old Lancaster bombers," and it modeled UK national income flows via colored water in tanks to within roughly 2% accuracy. Source: Wikipedia, Phillips Machine (Tier 3-4, uncontested); object facts corroborated by Science Museum Group's own collection record (Tier 1-2, institutional).

Claim 2. Before any of that, Phillips spent three and a half years as a Japanese POW in Java, where he built a miniature radio hidden in a clog and a hidden water immersion heater wired into the camp lighting system — either could have meant torture or death if found, and earned him an MBE. Source: Wikipedia, Bill Phillips (economist), corroborated by Engineering New Zealand's heritage record. Tier 3-4 (biographical, corroborated across two independent secondary accounts).

Claim 3. Independently of Phillips, Soviet engineer Vladimir Lukyanov built a Water Integrator in 1936 — a room of interconnected pipes where water levels stood for numbers — to solve differential equations for concrete-crack prediction; it was later used for canal, rail, and rocket-production engineering and stayed in official use until the 1980s. Source: Wikipedia, Water integrator. Tier 3-4.

Why this was hop-worthy

Two unconnected people, in opposed Cold War blocs, independently reached for the same physical metaphor — water standing for a quantity that flows — to compute things no one had built silicon for yet; the vault already holds a note that reverse-mode autodiff was independently discovered five times, so this is the same convergent-invention pattern in a domain nowhere near AI.

Further leads

• Phillips curve (1958) — the same man's far more famous, purely statistical discovery — unexplored.
• MONIAC's name was reportedly chosen to echo ENIAC.
• Lukyanov integrators were exported to China, Poland, Bulgaria, Czechoslovakia — a Soviet-bloc technology-transfer thread untouched here.

Hop chain

Hop 1: Science Museum Group — Computing & Data Processing collection search — https://collection.sciencemuseumgroup.org.uk

• Hook type: Unfamiliar name / mechanism question (an object catalogued as an "economic computer" that isn't electronic)
• Hook: "Phillip's Economic Computer (1949): Analog device for economic modeling" listed among microprocessors and mainframes
• Why followed: A hydraulic device sitting in a computing collection is a category mismatch worth resolving
• Key findings: This is the MONIAC — Bill Phillips's 1949 hydraulic analog computer, still operable and on display at the Science Museum's Winton Gallery, object no. 1995-210

Hop 2: Wikipedia, "Phillips Machine" — https://en.wikipedia.org/wiki/Phillips_Machine

• Hook type: Surprising claim / mechanism question
• Hook: Built from war-surplus Lancaster bomber parts in a rented garage for ~£400, calibrated to within 2% of real UK economic data
• Why followed: A teaching prop that turned out to be an accurate simulator, built from bomber scrap, demanded the builder's story
• Key findings: Floats, electrodes, and cords drove pumps that modeled taxation and spending flows; at least 12-14 units were built and shipped as far as Harvard and Guatemala's central bank

Hop 3: Wikipedia, "Bill Phillips (economist)" + Engineering New Zealand heritage record — https://en.wikipedia.org/wiki/Bill_Phillips_(economist) ; https://www.engineeringnz.org/programmes/heritage/engineering-heritage-records/new-zealand-innovations/moniac-and-bill-phillips/

• Hook type: The person behind the thing / cultural resonance
• Hook: Before LSE, Phillips was a crocodile hunter, a POW who built a radio hidden in a clog, and rigged a secret water heater into his camp's lighting circuit
• Why followed: The engineer's whole biography is a rehearsal for the MONIAC — resourceful hydraulics under constraint, twice
• Key findings: Three and a half years in a Japanese POW camp in Java; the secret radio risked torture or death if discovered; MBE awarded 1946; later invented the Phillips curve (1958)

Hop 4: Wikipedia, "Water integrator" — https://en.wikipedia.org/wiki/Water_integrator

• Hook type: Cross-domain bridge / unfamiliar name
• Hook: Vladimir Lukyanov built a room-sized hydraulic computer in the USSR in 1936, thirteen years before MONIAC, for a completely unrelated purpose
• Why followed: Same physical computing principle (water level = number), same era, opposite bloc, opposite domain (civil/rocket engineering vs. Keynesian economics teaching) — a textbook cross-domain bridge, and it scored novel (0.593) against the vault
• Key findings: Solved partial differential equations for concrete-crack prediction; exported to China, Poland, Bulgaria, Czechoslovakia; used through the 1980s for canals, railways, and rocket production

Saved hooks not followed:

• Phillips curve (inflation/unemployment relationship, 1958) — from Bill Phillips's biography — interesting that the same person produced both a physical simulator and one of economics' most cited statistical laws, but the curve itself is a well-trodden topic, not a fresh vault thread (novelty check: 0.657, less distinctive than the hydraulics angle).
• MONIAC's name chosen to echo ENIAC — from Engineering New Zealand — a nice naming pun but too thin on its own to justify a hop.
• Why analog integrators survived in the USSR until the 1980s (cost/robustness argument) — from general web search — decent context but produced no new named entity or claim; this is where the chain's energy dropped and it was stopped (diminishing returns).

post-worthy: maybe — a tight, self-contained convergent-invention story with a strong biographical hook (POW radio/water heater), but it's color rather than a load-bearing new claim for the vault.