Around 1820, Charles Xavier Thomas created the first successful, mass-produced mechanical calculator, the Thomas Arithmometer, that could add, subtract, multiply, and divide.

Around 1820, free reed designs began being created in Europe.

Around 1820 they had settled on the Zambian side at Feira ( now Luangwa ).

Around 1820 an estancia ( station ) was established a few miles north on the banks of the Santa Ana River to accommodate the Mission's sizeable cattle herd.

Around 1820, the Japanese inventor Kunitomo Ikkansai developed various manufacturing methods for guns, and also created an air gun based on the study of Western knowledge (" rangaku ") acquired from the Dutch in Dejima.

Around 1820 the entire Zugspitzplatt was glaciated, but of this Platt Glacier ( Plattgletscher ) only the Northern and Southern Schneeferner remain.

Around 1820 a new loom was invented in Teufen, allowing embroidery in one go.

Around 1820 Samuel Budgett became a partner and the name became H. H.

Around 1820, William " Killymoon " Steward built one of the first tavern / inns in the area.

Around 1820 Bayre sculpted Hercules with the Erymanthean Boar, depicting Hercules during his third Labor, where he had to capture, live, a wild boar from Mount Erymanthos.

Around 1820 " General Geography " was established by Carl Ritter.

Around 1820, at age 19, Heber set out on his own.

Around 1820, it was known as Freeport.

Around 1820 the senior Rowland Hazard renamed the nearby industrial village to Wakefield after the town and family of the same name in England, who were friends of his.

Around 1820, Hicks made the first of his many paintings of The Peaceable Kingdom.

Around 1820 he tried to find a medicine to improve appetite and digestive well-being of the soldiers.

Around 1820, a mestizo rancher named Augustine Machado began grazing his cattle on the Ballona wetlands and claimed a fourteen-thousand acre Mexican land grant that stretched from modern-day Culver City to Pico Boulevard in Santa Monica.

If nothing else, at least two good songs came out of the project, `` Out Of This World '' and `` June Comes Around Every Year ''.

Around two dozen of the 92 naturally-occurring chemical elements are essential to various kinds of biological life.

Around two dozen of the elements are essential to various kinds of biological life.

Around two million years ago the first of many continental glaciers of the Laurentide Ice Sheet moved southward from the Hudson Bay area, initiating the Pleistocene glaciation.

Around two million people visit the canal each year on pleasure cruises and related activities.

Around 650 Saint Amand founded two abbeys in Ghent: the Saint Peter Abbey ( Blandinium ) and the Saint Bavo Abbey.

Around the year 197, Rome divided Britannia into two provinces, Britannia Superior and Britannia Inferior ; sometime after 305, Britannia was further divided, and made into an imperial diocese.

Around the same time, he appeared in two episodes of a twist-in-the-tale episode of the British TV series, Tales of the Unexpected, with Wendy Hiller ( 1979 ), and Gloria Grahame ( 1980 ).

Around this time Johann Bernoulli's two sons, Daniel and Nicolas, were working at the Imperial Russian Academy of Sciences in St Petersburg.

Around the year 1900 Lord Rayleigh developed the duplex ( combination of two ) theory of human sound localization using two binaural cues, interaural phase difference ( IPD ) and interaural level difference ( ILD ) ( based on analysis of a spherical head with no external pinnae ).

Around half of people initially diagnosed with bipolar disorder achieve syndromal recovery ( no longer meeting criteria for the diagnosis ) within six weeks, and nearly all achieve it within two years, with nearly half regaining their prior occupational and residential status in that period.

Around the middle of the 13th century, various legends developed that, after Richard's capture, his minstrel Blondel travelled Europe from castle to castle, loudly singing a song known only to the two of them ( they had composed it together ).

Around 695, two early English missionaries, Hewald the White and Hewald the Black, were martyred by the vicani, that is, villagers.

Around two years later on June 4, 1974, the NFL gave the city an expansion franchise.

Around the 10th century, the city-states of Dvaravati merged into two mandalas – the Lavo ( modern Lopburi ) and the Supannabhum ( modern Suphanburi ).

Around 600, however, Sophronius of Jerusalem noted that " two epistles bearing his name ... are considered by some to be the work of a certain John the Elder " and, while stating that Revelation was written by John on Patmos, it was “ later translated by Justin Martyr and Irenaeus ”, presumably in an attempt to reconcile tradition with the obvious differences in Greek style.

Around 1058, a revolt on the island of Bahrain led by two Shi ' a members of the Abd al-Qays tribe, Abul-Bahlul al -' Awwam and Abu ' l-Walid Muslim, precipitated the waning of Qarmatian power and eventually the ascendancy to power of the Uyunids, an Arab dynasty belonging to the Abdul Qays tribe.

Around 1670, two events caused the growth of VOC trade to stall.

Around eleven women and two men were arrested and left in the heat, denied medical attention, and verbally abused by police officers.

Around the city there are also two other football pitches, indoor tennis courts, badminton courts and a swimming pool.

Around Lully's time, it became a common practice to score this middle section for a trio ( such as two oboes and a bassoon, as is common in Lully ).

Around 1145 William went to Europe to continue his education in the schools of France and Italy, especially in those of Paris and Bologna, " the two most important intellectual centers of twelfth-century Christendom.

Around the same time the relationship between the two was also the subject of a stage play called Pete and Dud: Come Again.

Around two thirds of Northern Ireland's seaborne trade, and a quarter of that for Ireland as a whole, is handled at the port which receives over 6, 000 vessels each year.