Technologies
Each entry explains a technology, the problems it solves and its connections.
Filters: 1800 – 1945Clear
Bolt-action repeating rifle
Late 19th century: magazine-fed bolt-action rifles developed and became widespread · matureMilitaryA rifle with a manually operated bolt and a magazine that feeds successive rounds; here, “repeating” does not mean automatic fire.
Metallic cartridges
Developed in the mid-19th century; conversion applications around 1866 are the reference point verified in this review · matureMaterials · MilitaryMetallic cases hold ammunition components together and help seal breech-loading mechanisms, making them an important part of modern firearm systems.
Reinforced concrete
Developed from reinforced products into structural systems in the mid-to-late 19th century · matureIndustry · MaterialsConcrete incorporates reinforcing elements such as steel bars, which work together with it to improve tensile and flexural performance.
Paper cartridge
Origins remain to be verified; the artifacts confirmed in this review date to no later than 1859 · replacedMilitaryA unit that uses paper to combine some ammunition components in advance for easier transport and use, with a structure distinct from a metallic cartridge case.
Percussion ignition
1807: Forsyth's percussion mechanism patent marks a definite milestone · replacedMilitaryInitiates a primer through mechanical impact, marking an important shift from spark ignition toward the ignition systems of modern ammunition.
Semi-automatic rifles
Late 19th to early 20th century: early self-loading rifles appeared · matureMilitaryUses energy from firing to complete the loading cycle automatically, while firing only one round for each pull of the trigger.
Cement rotary kiln firing
Gradually adopted in industrial cement production in the late 19th century · matureEnergy · Industry · MaterialsA slowly rotating, inclined kiln moves and heats material, enabling continuous production of cement clinker.
Minié ball
1840s: development of the Minié ball, with a clearly documented milestone around 1848 · replacedMilitaryA projectile that changes its fit during firing eases the conflict between convenient loading and effective rifling engagement in muzzleloading rifles.
Percussion rifle-musket
Mid-19th century: an important stage in military rifled muzzleloaders · replacedMilitaryA muzzleloading long gun combining percussion-cap ignition, rifling and a suitable projectile, with the Pattern 1853 Enfield as a typical example.
Assault rifles
1940s: designs such as the StG44 gave the modern assault rifle category a clear form · matureMilitaryA category of automatic rifle that balances rifle use with the need for automatic fire at close range, typically using intermediate cartridges and offering selective fire.
Automatic rifle
Early 20th century: development of rifles capable of automatic fire, with the BAR as a representative example · matureMilitaryA category of rifles capable of automatic loading and continuous fire; the meaning of "automatic rifle" must be distinguished across historical contexts.
Milling
Early 19th century: specialized cutting machinery developed by Hall and others · matureIndustryA machining method that removes material with a rotating cutter, contributing to consistency of mechanical parts and the machining of complex surfaces.
Interchangeable-parts manufacture
Developed in the early 19th century; Hall's project of 1819–1822 is a verified example · matureIndustryUses dimensional consistency and process control to make parts of the same type interchangeable, reducing the burden of individual fitting and maintenance.
Lever-action repeating rifle
1860s: clearly documented examples in the Henry and Winchester lines · matureMilitaryA manually operated lever mechanism works with an ammunition-feeding system to enable repeated firing, forming one parallel approach to manually operated repeating firearms.
Artificial neural networks
The 1943 McCulloch–Pitts model of a logical neuron is an early reference point · matureInformation · Mathematics and MethodologyInterconnected artificial computational units use their connection structure and parameters to represent transformations from inputs to outputs.
Binary numeral system
Developed in the 17th century; used in electronic computing in the 20th century · matureIndustry · InformationA numeral system that uses only 0 and 1 to represent values and states, providing a common representation for reliable digital switching and computer encoding.
Boolean algebra
1847–1937 · matureIndustry · InformationA mathematical system that represents truth values and logical operations with algebraic rules, providing a formal method for designing combinations of logic gates and switching circuits.
Central processing unit
1945–1951 · matureIndustry · InformationThe core computer component that executes instructions, performs arithmetic and logical operations, and coordinates registers, memory, and input/output.
Charcoal production
Known in antiquity; became a metallurgical fuel before and around modern industrialization · matureEnergy · Industry · MaterialsHeating wood with no oxygen or limited oxygen to obtain a solid fuel with a higher fixed-carbon content and better suitability for high-temperature combustion.
Digital logic circuits
1937–1948 · matureIndustry · InformationA system of circuits that processes information using discrete signals and logic gates, implementing binary representation and Boolean rules as hardware that can be combined.
Electric generators
Developed during the 19th century from magneto-electric machines into practical self-excited generators · matureEnergy · IndustryA device that converts rotational mechanical work into electrical energy through electromagnetic induction.
Electric power systems and grids
Central power stations appeared in 1882; scalable AC transmission systems took shape in the late 19th century · matureEnergy · Industry · Information · TransportA system for supplying and consuming electrical energy that combines generation, voltage transformation, transmission, distribution, protection, and dispatch.
Electromagnetic induction
Discovered in 1831; self-excited generators developed in the late 19th century · matureEnergy · Information · Mathematics and MethodologyThe physical principle by which changing magnetic flux induces an electromotive force in a conductor, linking mechanical motion with electric current.
Caplock firearm
First half of the 19th century: percussion-cap ignition developed and entered military use · replacedMilitaryReplaced flint-and-steel ignition with a percussion cap, representing the most direct change in firearms after the flintlock.
Portland cement
1824: Portland cement patent; key advances in clinker production in the 1840s · matureIndustry · MaterialsA hydraulic binder made by firing a prepared mix of calcareous and siliceous/aluminous raw materials into silicate clinker, then grinding it with gypsum and other materials.
Single-shot breech-loading rifle
Mid-to-late 19th century: widespread use of single-shot breech-loading rifles with metallic cartridges · replacedMilitaryA rifle loaded from the rear with one round at a time; this entry focuses on 19th-century military types using metallic cartridges.
Photovoltaic cell
1839: discovery of the photovoltaic effect; 1954: silicon photovoltaic cells became practical for power generation · matureEnergy · Industry · MaterialsA device that uses the photovoltaic effect in semiconductors to convert solar radiation directly into direct-current electricity.
Vacuum tube
1904–1906 · matureIndustry · InformationAn electronic device that uses the movement of electrons in a vacuum for rectification, amplification or switching, and was the main active device in early electronic computers.