Four-Stroke Internal-Combustion Engine

German inventor Nikolaus Septust Otto developed a four-stroke internal-combustion engine in 1876. Continue reading

Construction of the Holland Tunnel

Construction of the Holland Tunnel began on October 12, 1920 that runs between New York, NY, and Jersey City, NJ, USA, beneath the Hudson River. Continue reading

Development of Rotary Internal Combustion Engine

German engineer Felix Wankel developed the rotary internal-combustion engine in 1954-56 while at the NSU Motorenwerke AG in Neckarsulm, Germany. Continue reading

Jet Aircraft Engine Afterburner Invented

Rolls-Royce Limited of Derby, Derbyshire, England developed a jet aircraft engine afterburner in 1945. Continue reading

Invention of Hydraulic Mortar

English civil engineer John Smeaton formulated the hydraulic mortar while experimenting with underwater mortar mixtures in 1756, Continue reading

Invention of DNA Chain Polymerization

American researcher Kary B. Mullis, a staff chemist for the Cetus Corporation in Emeryville, CA, USA invented DNA chain polymerization in 1983. Continue reading

Commercial Atmospheric-Pressure Piston Steam Engine

Thomas Newcomen built the atmospheric-pressure piston engine that superseded Thomas Savery’s engine. Continue reading

Binding Stone Cement Created in Rome

Binding stone cement was used in various formulas from early antiquity and used by Romans of circa 150 BCE, Continue reading

Pierre Riquet

Paul Riquet was born in Béziers, Hérault, France, the eldest son of solicitor, state prosecutor and businessman Guillaume Riquet.<--!more--> As a youth, Riquet was only interested in mathematics and science. He married Catherine de Milhau at age 19.

As a fermier général (“farmer-general”) of Languedoc-Roussillon, he was a tax farmer responsible for the collection and administration of the gabelle (salt tax) in Languedoc. He was appointed collector in 1630, and was also a munitions provider to the Catalan Army. Riquet became wealthy and was given permission by the King to levy his own taxes. This gave him greater wealth, which allowed him to execute grand projects with technical expertise.

More info at: Pierre-Paul Riquet – Wikipedia

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Additional Information:

Pont Royal Bridge Built Using Open Caissons

Pont Royal bridge in Paris, France was built using open caissons in 1685. Continue reading