This infographic compares selected technologies by the jobs they did and how their tools changed—from sending messages and calculating values to taking photographs and combining everyday functions in a smartphone. It is a set of representative milestones, not a complete history: technologies develop in different places and at different speeds, and newer tools often build on rather than simply replace older ones.
Past and present technology at a glance
| Task | Then: selected examples | Now: selected example | What changed |
|---|---|---|---|
| Send information over distance | Telegraph, telephone, radio and television | Digital computers connected through networks | Communication moved through successive electrical and digital systems; networked computing combines communication with information processing. |
| Calculate and process information | Difference engines and slide rules | Digital computers | Mechanical devices could calculate successive values and print tables; slide rules enabled analog calculation by aligning scales. Digital computers process information electronically. |
| Use several tools on the move | Separate devices for calling, photography, radio, television, computing and lighting | A smartphone | Functions once associated with distinct devices can be brought together in a pocket-sized package. |
The comparisons describe functions and forms, not a universal score of which era was faster, cheaper, better or more accessible. The examples are drawn from Smithsonian and PBS accounts, each with its own historical scope and dating.
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What did people use before smartphones and computers?
There was no single predecessor. People used different tools for different jobs: telegraphs and telephones for communication, mechanical calculators and slide rules for calculation, and separate cameras, radios, televisions and flashlights for other tasks. The National Museum of American History describes smartphones as bringing a battery-powered telephone, camera, radio, television, computer, flashlight and more into a pocket-sized package. That is an illustrative museum description, not a specification that applies to every smartphone.
How communication tools changed
The National Museum of American History’s account traces a sequence from the telegraph to the telephone, radio and television, and then to digital computers and networks. These technologies changed how information could be sent and received, and networked computing joined communication with the processing and sharing of digital information.
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This was not just a sequence of devices. The museum notes that business, politics, wars and consumer interests helped shape technological development. A timeline is most useful when it shows both the tool and the context in which people adopted or used it.
From mechanical calculation to digital computing
Difference engines
Nineteenth-century difference engines were mechanical calculating devices designed to compute successive values and print mathematical tables. They automated a specific kind of calculation; they were not general-purpose computers in the modern sense. The Smithsonian’s overview of difference engines describes their role in the history of calculating machines.
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Slide rules
A slide rule is an analog computing device: the user aligns marked scales to perform operations. The Smithsonian notes that slide rules were common among technical students in the 1950s and 1960s. They show that computation did not always require a machine that automatically produced a digital result; the user manipulated the instrument and interpreted its scales. The Smithsonian’s slide-rule overview explains this method.
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Computing’s history includes distinct milestones rather than one date when “the computer” arrived. PBS identifies the Moon landing in 1969, the commercial introduction of a silicon microprocessor in 1971, and networked multimedia computing reaching homes and workplaces by the mid-1990s. These markers refer to different events and stages; they should not be read as a single invention date or as the only turning points.
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Selected milestones, not a complete timeline
| Date or period | Milestone | How to read it |
|---|---|---|
| 1969 | PBS identifies the Moon landing. | A year-specific marker on PBS’s technology timeline, not a claim that one event accounts for all technological change. |
| 1971 | PBS identifies the commercial introduction of a silicon microprocessor. | A commercial-introduction marker; it is not a claim about the first related research or invention. |
| Mid-1990s | PBS describes networked multimedia computing reaching homes and workplaces. | An approximate period marking broader reach, not a precise launch date. |
Dates can refer to invention, first use, commercial introduction or wider adoption, and those are not interchangeable. These examples also have particular institutional and historical contexts. The Smithsonian’s technology overview spans a much broader range, from Stone Age tools and the Apollo 11 moon landing to 3D digitization and AI; it describes the scope of its museums’ work, not a complete universal chronology. Smithsonian, Explore Technology & Innovation.
How to read a then-and-now comparison
A useful comparison asks what a tool let people do, how it handled information or energy, who could use or carry it, and whether it combined functions that used to require separate devices. These questions help explain change without assuming that every new technology makes an older one obsolete or is automatically superior.
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