01What this series covers
Forty-one milestones between 1970 and 2020 — the period in which engineering became largely a matter of what the software does and what the process yields.
The first series in this set covered 1845 to 1910, in which the decisive achievements were devices. The second covered 1911 to 1969, in which they became systems. This series covers what followed, and the character changes once more. Between 1970 and 2020 the dominant engineering questions are about information and process: what the control law computes, what the fabrication yield is, what the learning curve does to unit cost, and what the safety case actually argues.
Two features distinguish this period from the two before it. First, the marginal cost of computation fell to almost nothing, which meant that any problem expressible as a calculation could be moved into software, and most were. Second, several technologies entered sustained cost declines driven by cumulative manufacturing volume rather than by discrete invention — a different kind of progress, and one that rewards persistence over cleverness.
This series follows Milestones of the Modern Era 1845-1910 and Milestones of the Modern Era 1911-1969. Each part is independent and any of the three can be read first, but several entries here are explicitly the sequel to an entry in an earlier part, and those connections are noted where they occur.
Historical significance needs distance to assess, and this series does not have much of it. Entries before roughly 2000 can be judged on their consequences, which are now visible. Entries from the 2010s are included because their engineering content is clear and instructive, but their long-term standing is genuinely unsettled — some will look more important in thirty years and some will look less. Where a recent entry is included on the strength of its engineering rather than its demonstrated historical weight, this series says so rather than implying a verdict it cannot support.
This is one of six series covering the history of engineering from the first engineered cities to 2020. The other five are From the First Cities to the Age of Steam, Milestones of the Modern Era 1845-1910, Milestones of the Modern Era 1911-1969, The Age of Applied Science, and Transport Engineering 1845-1950. The four period series are chronological and the two thematic ones — applied science, and transport — cut across the same span by subject. Each is independent and any can be read first.
02Six structural shifts
Six changes recur across unrelated disciplines in this period, and together they explain why the era feels different from the one before it.
From mechanism to control law
Aircraft, engines, vehicles, power converters and launch vehicles were all stabilised by computation rather than by inherent physical stability. This bought performance that passive stability cannot reach, and made software correctness a structural safety concern.
From invention to learning curve
Photovoltaics, lithium cells, sequencing and semiconductors all fell in cost by roughly fixed proportions per doubling of cumulative production. Progress came from thousands of process improvements, not from a breakthrough.
From product to platform
Computing, telecommunications and biotechnology each converged on general substrates — the microprocessor, the packet network, the recombinant cell line — with the application expressed as configuration on top.
From prescription to safety case
Regulation moved from complying with prescribed rules to demonstrating, with evidence, that risk is acceptable. This followed directly from a run of catastrophes in which everything prescribed had been done.
From analogue signal to sampled data
Telephony, imaging, broadcasting, measurement and control all became sequences of numbers. Once digitised, the constraints become bandwidth, storage and algorithm rather than the physics of the transducer.
From fuel to capital
Wind, solar and battery systems shifted energy economics from ongoing fuel cost to upfront capital, changing what is optimised, how projects are financed and how power systems must be operated.
03Master timeline, 1970–2020
All forty-one milestones in date order. Where credit or dating is contested, the entry says so and the relevant topic part sets out the dispute.
- 1971The microprocessorElectronics
Intel’s 4004 places a complete processor on one chip. Several comparable devices were developed around the same time, and priority is genuinely contested.
- 1971Computed tomographyBiomedical
Godfrey Hounsfield’s scanner produces the first clinical cross-sectional images, turning imaging into a computational reconstruction problem.
- 1973EthernetNetworks
Robert Metcalfe and David Boggs describe a shared-medium local network with randomised retry, which becomes the standard way computers are connected in a building.
- 1976Public-key cryptographySecurity
Diffie and Hellman publish key exchange without a shared secret; RSA follows in 1977. Equivalent work at GCHQ was classified and disclosed only much later.
- 1977Magnetic resonance imagingBiomedical
The first human images are produced, following the spatial encoding methods of Lauterbur and Mansfield. Priority in this field is disputed and remains so.
- 1979Three Mile IslandProcess safety
A partial core melt with no fatalities, caused by a stuck relief valve, misleading indication and reasonable operator actions on wrong information.
- 1980Flash memoryElectronics
Fujio Masuoka’s work at Toshiba leads to non-volatile solid-state storage that can be erased in blocks, eventually displacing rotating magnetic media.
- 1981Lead-rubber base isolationCivil
The William Clayton Building in Wellington is completed on lead-rubber bearings developed by Bill Robinson, decoupling a structure from ground motion.
- 1982Recombinant human insulinBioprocess
A therapeutic protein produced by engineered bacteria is approved for use, establishing living cells as a manufacturing platform.
- 1983TCP/IP transitionNetworks
ARPANET switches to the TCP/IP protocol suite on a set date, creating a common addressing and transport layer over dissimilar networks.
- 1983StereolithographyManufacturing
Chuck Hull builds parts by curing photopolymer layer on layer, beginning additive manufacture and making geometry nearly free of tooling constraints.
- 1983Passivated emitter rear cellEnergy
Martin Green’s group at the University of New South Wales develops the PERC architecture, which becomes the mainstream silicon cell design decades later.
- 1986ChallengerAerospace safety
A solid booster joint seal fails at low temperature. The investigation exposes a decision process that had normalised evidence of a known defect.
- 1986ChernobylNuclear safety
A reactor with a positive void coefficient is driven into an unstable regime during a test. The concept of safety culture enters engineering vocabulary from the analysis.
- 1988Digital fly-by-wire airlinerControl
The Airbus A320 enters service with digital flight control and envelope protection, placing computation permanently between pilot and control surface.
- 1988Piper AlphaOffshore safety
An offshore platform fire kills 167. The inquiry produces the safety case regime that now governs major hazard facilities in much of the world.
- 1989World Wide WebNetworks
Tim Berners-Lee proposes a hypertext system over the existing internet; the first server runs in 1990–91. The Web is an application, not the network itself.
- 1991Commercial lithium-ion cellEnergy storage
Sony brings to market a cell drawing on work by Whittingham, Goodenough and Yoshino, offering roughly triple the energy density of the nickel-cadmium it replaced.
- 1991GSM digital mobile serviceCommunications
A digital cellular standard agreed across many countries begins service, making handsets interoperable across borders and separating identity from device.
- 1991First offshore wind farmEnergy
Vindeby in Denmark demonstrates offshore wind generation, beginning a scaling programme that eventually produces the largest rotating machines ever built.
- 1994Channel Tunnel opensCivil
Fifty kilometres of bored tunnel beneath the sea, driven from both ends with a survey tolerance that had to close within centimetres.
- 1995Satellite positioning fully operationalNavigation
GPS reaches full operational capability, making precise position and time available to anyone with a receiver and no transmission of their own.
- 1997Mass-produced hybrid powertrainTransport
A production car combines engine and electric machine through a power-split device with regenerative braking, decoupling engine speed from road speed.
- 1998Functional safety standardisedSystems
IEC 61508 gives a quantified framework for safety-related electrical, electronic and programmable systems, and a common vocabulary of integrity levels.
- 1998LongfordProcess safety
An explosion at a Victorian gas plant kills two and interrupts supply to a state for weeks. The inquiry addresses knowledge, staffing and hazard identification.
- 2003Human Genome Project completedBiomedical
A reference human genome sequence is published, after which sequencing cost falls faster than semiconductor cost did over comparable periods.
- 2003ColumbiaAerospace safety
Foam strike damage to the wing leading edge causes loss on re-entry. The investigation finds organisational causes closely mirroring Challenger seventeen years earlier.
- 2004Millau ViaductCivil
A multi-span cable-stayed viaduct with deck launched incrementally over piers of unprecedented height, in a valley with significant wind exposure.
- 2006Metropolitan seawater desalinationCivil
Perth commissions Australia’s first large seawater reverse osmosis plant, making urban water supply independent of rainfall for the first time.
- 2006Utility computing at commodity scaleComputing
Computing capacity becomes purchasable by the hour without owning hardware, converting a capital decision into an operating one.
- 2007The smartphoneCommunications
A pocket general-purpose computer with capacitive multi-touch, cellular data, positioning and inertial sensing consolidates a dozen devices into one.
- 2010Burj KhalifaCivil
A buttressed core tower above 800 metres, shaped so that its cross-section changes with height to disorganise vortex shedding.
- 2010Deepwater HorizonOffshore safety
A well control failure kills eleven and causes a prolonged subsea release. Barrier management, cement evaluation and blowout preventer reliability are all implicated.
- 2011Composite primary airframe in serviceMaterials
A large airliner enters service with a carbon fibre fuselage and wing, forty-eight years after usable carbon fibre was first produced.
- 2012Programmable gene editingBiotech
CRISPR-Cas9 is shown to work as a guided cutting tool. Credit is contested between several groups and was litigated at length.
- 2012Deep networks at scaleComputing
A deep convolutional network trained on graphics hardware substantially outperforms prior image classification methods, redirecting the field.
- 2015Propulsive landing of an orbital boosterAerospace
An orbital-class first stage lands vertically under its own power; the first reflight of a recovered booster follows in 2017.
- 2015Certified additively manufactured metal partManufacturing
A printed metal component enters certified service in a commercial jet engine, consolidating twenty parts into one.
- 2017Grid-scale battery for frequency servicesEnergy
The Hornsdale Power Reserve in South Australia demonstrates that inverter-connected storage can provide fast frequency response better than synchronous plant.
- 2019Extreme ultraviolet lithography in productionElectronics
EUV reaches volume manufacturing after roughly two decades of development, extending feature scaling past the limits of deep ultraviolet.
- 2020mRNA vaccine manufactured at scaleBioprocess
A nucleic acid product with lipid nanoparticle delivery is manufactured and distributed in enormous quantity within a year of sequence availability.
04Series map
Thirteen topic parts grouped by engineering problem, sequenced so that enabling technologies precede what was built with them.
05Six recurring patterns
| Pattern | Where it appears | Why it generalises |
|---|---|---|
| Cost falls with cumulative volume, not time | Photovoltaics, lithium cells, sequencing, semiconductors | Learning rates are roughly constant per doubling of production, so forecasting by calendar year is systematically wrong. |
| Stability moved into software | Fly-by-wire, engine control, power converters, booster landing | Accepting an unstable plant and stabilising it computationally buys performance passive design cannot reach, at the cost of software becoming safety-critical. |
| Organisational causes dominate catastrophes | Challenger, Columbia, Piper Alpha, Longford, Deepwater Horizon | In every case the physical mechanism was known or knowable; the failure was in how evidence was handled, not in what was understood. |
| Standardise the substrate, express the product as configuration | Microprocessor, TCP/IP, recombinant cell lines, cloud infrastructure | A general substrate amortises enormous development cost across applications that its designers never anticipated. |
| Long lag from feasibility to deployment | PERC cell, carbon fibre airframes, EUV, additive manufacturing | Two to four decades between a working demonstration and volume production is normal, and the interval is filled with process engineering. |
| Removing a constraint relocates it | Additive geometry, cloud capacity, renewable fuel cost | Freeing one variable makes some other one governing: qualification, cost control, or system inertia and firming. |
06How to use this series
Each part stands alone. Every part ends with takeaways aimed at current practice rather than historical interest, and cites Australian and international standards by number where a working engineer would go to find the governing requirement. Standards are cited for orientation only, are not quoted, and change over time — verify currency before relying on any reference here.
Where attribution is contested, this series names the parties and describes what each demonstrably contributed rather than nominating a single inventor. In this period that applies to the microprocessor, magnetic resonance imaging, public-key cryptography and gene editing, among others.