Before this discovery, it is widely believed that bricks appeared about 3000 years ago in the Western Zhou dynasty since the earliest bricks were found in Western Zhou ruins.

Before Moseley's discovery, the atomic numbers ( or elemental number ) of an element had been thought of as a semi-arbitrary sequential number, based on the sequence of atomic masses, but modified somewhat where chemists found this to be desirable, such as by the great Russian chemist, Dimitri Ivanovich Mendeleev.

Before the actual discovery of mendelevium, the trivalent state was the most stable one in aqueous solution.

Before Leeuwenhoek's discovery of microorganisms in 1675, it had been a mystery why grapes could be turned into wine, milk into cheese, or why food would spoil.

( Before the discovery of quarks, the term " strong interaction " referred to just internucleon interactions.

Before the relatively recent discovery of neurons and their role in pain, various different body functions were proposed to account for pain.

Before the discovery of the ubiquitin proteasome system, protein degradation in cells was thought to rely mainly on lysosomes, membrane-bound organelles with acidic and protease-filled interiors that can degrade and then recycle exogenous proteins and aged or damaged organelles.

Before the discovery of radioactivity, uranium was primarily used in small amounts for yellow glass and pottery glazes, such as uranium glass and in Fiestaware.

Before the discovery of a live coelacanth specimen, the coelacanth time range was thought to have spanned from the Middle Devonian to the Upper Cretaceous period.

Before the discovery of refrigeration, many sushi connoisseurs were at risk of contracting diseases.

Before the discovery of quantum effects and other challenges to Newtonian physics, " uncertainty " was always a term that applied to the accuracy of human knowledge about causes and effects, and not to the causes and effects themselves.

Before announcing the discovery, the foundation first recruits as many of these people as it can.

Before Scheele made his discovery of oxygen, he studied air.

Before the synthesis of ununseptium, none of ununseptium's daughter isotopes were known ; thus, there was no basis for an JWP discovery claim, much less for its recognition.

Before the discovery of tetracycline and chloramphenicol during the latter 1940s, as many as 30 percent of persons infected with R. rickettsii died.

Before the discovery of antibiotics, pure mountain air was thought to be curative for patients with tuberculosis.

Before he reveals this discovery to the other Eternals, Harlan exacts a price, his lover is to be returned to him and both will go back to rescue Cooper.

Before the discovery of Centurion, the tallest known specimen was Icarus Dream, which was rediscovered in Tasmania in January, 2005 and is high.

Before the discovery of Mendelian genetics, one common hypothesis was blending inheritance.

Before the discovery of ribozymes, enzymes, which are defined as catalytic proteins, were the only known biological catalysts.

Before the discovery of magnetite in 1727, Kamaishi was little different from any of the other small fishing communities along the coast.

Before its discovery, the taxon was believed to have become extinct during the Miocene ; when it was discovered, it was heralded as a " living fossil ".

Before the discovery of Hyperion, the tallest redwood ever measured was the Dyerville Giant, also in Humboldt Redwoods State Park.

Before the discovery of America, the word Hart was common in surnames.

Before railway construction on the Continent demanded huge quantities of maleable iron mainly for rails, for which low quality iron sufficed, Wallonia was the only Continental region to follow the British model successfully.

Before World War II, Poland's industrial base was concentrated in the coal, textile, chemical, machinery, iron, and steel sectors.

Before the Han Dynasty ( 202 BC – 220 AD ), Chinese ploughs were made almost entirely of wood, except the iron blade of the ploughshare.

Before the Bessemer process, Britain had no practical method of reducing the carbon content of pig iron.

While the first iron ore was likely meteoric iron, and hematite was far easier to smelt, in Africa, where the first evidence of iron metallurgy occurs, limonite is the most prevalent iron ore. Before smelting, as the ore was heated and the water driven off, more and more of the limonite was converted to hematite.

Before loading, a piece of the paper or canvas covering had to be cut open immediately under the vent ; after the shot had been rammed home the vent was filled with powder from a priming horn, and the gun was then fired by means of a hot iron, quick match or port-fire.

Before the current in the electromagnet is turned on, the domains in the iron core point in random directions, so their tiny magnetic fields cancel each other out, and the iron has no large scale magnetic field.

Before this began, some of the timbers required treatment with triammonium citrate to remove residual iron residues in the nail holes of the outer hull planking.

Before the Revolutionary War, the area was mined for iron.

Before commencing treatment, there should be definitive diagnosis of the underlying cause for iron deficiency.

Before the running of the bulls, a set of wooden or iron barricades is erected to direct the bulls along the route and to block off side streets.

Before that time, cast iron pipe and fittings had to be imported from Europe.

Before the Severn Bridge was opened, the old cast iron road bridge across the Wye at Chepstow, built in 1816 to replace earlier wooden structures, carried all the road traffic between South West England and South Wales and was the lowest bridging point of the Wye.

Before the development of float glass, larger sheets of plate glass were made by casting a large puddle of glass on an iron surface, and then polishing both sides, a costly process.

Before the introduction of Huntsman's technique, Sheffield produced about 200 tonnes of steel per year based on Swedish wrought iron ( see Oregrounds iron ).

Before the technique of injecting air into molten iron was discovered by Kelly and by Bessemer, iron was available as cast iron, a strong but brittle metal made in a blast furnace by treating iron ore with coke derived from coal, and wrought iron, a more malleable and flexible metal made by heating iron ore in a low oxygen environment in a bloomery heated by charcoal and producing " blooms ", which were 100 to 200 pound lumps of very low carbon iron mixed with slag.

Alistair Horne describes the torture Ravaillac suffered: " Before being drawn and quartered ... he was scalded with burning sulphur, molten lead and boiling oil and resin, his flesh then being torn by pincers.

Before the days of antibiotics, sulphur was used in medicines as an antibacterial agent, in the making of match heads, and for sterilising wine corks.