Sir Charles Wheatstone discovered its principle and applied it as early as 1838 to the construction of a cumbersome but effective instrument, in which the binocular pictures were made to combine by means of mirrors.

Severn made a sketch of Trelawny in 1838.

The first direct measurement of the distance to a star ( 61 Cygni at 11. 4 light-years ) was made in 1838 by Friedrich Bessel using the parallax technique.

At the Speedwell Ironworks in Morristown, New Jersey, Morse and Vail made the first public demonstration of the electric telegraph on January 11, 1838.

Herschel returned to England in 1838, was created a baronet, of Slough in the County of Buckingham, and published Results of Astronomical Observations made at the Cape of Good Hope in 1847.

The last Congressional appropriation was made May 25, 1838, and in 1840 Congress voted against completing the unfinished portion of the road, with the deciding vote cast by Henry Clay.

Aijalon's identification with present-day Yalo was made by Edward Robinson during his travels in Palestine in 1838.

The earliest detailed surveys in the United States were made by the “ Topographical Bureau of the Army ,” formed during the War of 1812 ,. which became the Corps of Topographical Engineers in 1838.

Originally a part of Catahoula and Ouachita parishes, Caldwell Parish was established within its present boundaries on March 6, 1838, with earlier settlements recorded to have been made soon after the Louisiana Purchase in 1803.

Lieutenant George Grey travelled through the area in 1838 and made note of the remarkable caves he found in the area.

Elias P. Gilman petitioned the state and had surveys of Gilman made in 1838.

Among the friends he made here was the future Czech revolutionary poet Karel Havlíček, whose departure for Prague in 1838 may have influenced Smetana's own desire to experience life in the capital.

As an important market town, St Ives always needed large numbers of pubs, 64 in 1838 ( 1 for every 55 inhabitants ), 60 in 1861, 48 in 1865 and 45 in 1899 ( though only 5 of these made the owners living ).

Modest dividends were paid to shareholders from 1824, and the total traffic carried in 1838 was 181, 708 tons, on which profits of £ 6, 835 were made.

" Inspired by prior wedding statements made by John Stuart Mill and Harriet Taylor Mill in 1851, and by Theodore Dwight Weld and Angelina Grimké in 1838, the two wrote up a tract they called " Marriage Protest " and printed a number of copies to hand out at their wedding.

The first private land claim at the falls was made by Franklin Steele in 1838 — though he didn't obtain financing for development until 1847, in the form of $ 12, 000 for a 9 / 10 stake in the property.

Between 1834 and 1838, John Frederick William Herschel made observations of the southern skies with his reflector from the Royal Observatory at the Cape of Good Hope.

He developed a pyrheliometer and made, between 1837 and 1838, the first quantitative measurements of Solar constant.

In 1838 the London and Birmingham Railway was constructed around the town, and in 1840 the Midland Counties Railway made a junction with the London and Birmingham at Rugby.

In probate Caroline's son Sam produced a valid marriage license showing that Caroline and Samuel Colt were married in Scotland in 1838 and that this document made him a rightful heir to part of Colt's estate, if not to the Colt Manufacturing Company.

When his father was made Marquess of Normanby in 1838, he became known by the courtesy title Earl of Mulgrave.

During these years Droysen studied classical antiquity ; he published a translation of Aeschylus in 1832 and a paraphrase of Aristophanes ( 1835 – 1838 ), but the work by which he made himself known as a historian was his Geschichte Alexanders des Grossen ( History of Alexander the Great ), ( Berlin, 1833 and other editions ), a book that long remained the best work on Alexander the Great.

In 1838 he was transferred to the council of state as master of requests, which post he held through the revolution of 1848 and the coup d ' état till 1860, when he was made senator — a paid office, it must be remembered, and, in effect, a lucrative sinecure.

The first successful measurement of stellar parallax was made by Friedrich Bessel in 1838 for the star 61 Cygni using a Fraunhofer heliometer at Königsberg Observatory.

The first successful measurements of stellar parallax were made by Friedrich Bessel in 1838 for the star 61 Cygni using a heliometer.

Calotype or talbotype is an early photographic process introduced in 1838 by William Henry Fox Talbot, using paper coated with silver iodide.

Silver Hill Mine, located a few miles south of Lexington, opened in 1838, and was the first operating silver mine in the country.

Currency silver threepences from 1838 to 1926 were of identical design and cannot usually be distinguished except in the best conditions when the higher striking standard of the maundy coins stand out ; this resulted in the curious legal anomaly that when the currency was decimalised in 1971 all silver threepences from 1870 onwards were revalued at three new pence, not just the maundy coins.

He showed much promise, earning the silver palette of the Society of Arts in 1838.

In 1836 he travelled to Rome, gaining a silver medal from the Academy of St Luke in 1838 for his Cimabue and Giotto, which in the following year was exhibited at the Royal Academy.

* The Coronation Robes of the Kingdom of Lombardy-Venetia ( also designed by Philipp von Stubenrauch and executed by Johann Fritz in Vienna in 1838 ) are patterned similar to the Mantle of the Austrian Empire, but made out of blue and orange velvet, with white moiré, gold and silver embroidery, ermine and lace.

In November 1838, a force of about 1, 500 men started from New York to seal off the St Lawrence River and thereby allow a hypothetical revolt to take place in Upper Canada.

In 1838, Raymond introduced envelopes embossed with the seal of the colony, and available for local mail for 1¼ pence each instead of the 2d charged letters paid for in cash.

The device adopted in 1839 Following the incorporation of Birmingham as a borough in 1838, the corporation approved the design of a seal comprising " The Birmingham Arms, encircled with a wreath ", with the motto " Forward ".

The state seal supplanted the Iowa Territory seal ( 1838 – 1846 ), which consisted of a Federal eagle holding an arrow in its mouth and a bow in its talon.

Image: Iowa territorial seal. jpg | Iowa Territorial Seal, 1838.

* Konstanty Kalinowski ( 1838 – 1864 ), was one of the leaders of Lithuanian and Belarusian national revival and the leader of the January Uprising in the lands of the former Grand Duchy of Lithuania.

* A system of education devised by Joseph Lancaster ( 1778 – 1838 ).

When Daniels, Dennison & Co .' s business plans collapsed in 1838, after Madison was chosen to be the capital, Dewey moved to Lancaster, Wisconsin, where he was admitted to the bar in an examination held by Charles Dunn, the chief justice of the Supreme Court of Wisconsin Territory ; he was appointed district attorney of Grant County that same year.

She died September 8, 1838 at Lancaster.

In 1838, the Lancaster Female Seminary was incorporated, with Ellmaker as one of 10 trustees.

Joseph Lancaster ( 25 November 1778 – 23 October 1838 ) was an English Quaker and public education innovator.