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W. Watson And Son
W. Watson and Son was an optical instrument maker. In 1837, the William Watson business was established in London for the manufacture of optical instruments. By the 1840s, the company moved into lanterns, slides and associated equipment. In 1868, the name was changed to W. Watson & Son and by this time were located at 313 High Holborn, London. In the 1870s, the company added photographic equipment and became known as a leading manufacturer of the ''Highest Class Photographic Instruments and Apparatus'' in England. Into the 1940s, the company remained at 313 High Holborn. W. Watson and Sons On 9 January 1881 William Watson died. In 1883, the name of the company was changed to W. Watson & Sons as the son, Charles Henry Watson joined the business. The 1883 Kelly's Directory, Kelly's Business Directory listed both Charles Henry Watson and Henry Watson as associated with the Watson & Sons company located at 23 Walton Street, Aylesbury, England. In 1889, the company participated in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrotherapeutics
Electrotherapeutics is a general term for the use of electricity in therapeutics, i.e. in the alleviation and cure of disease. It is used as a treatment, like electroconvulsive therapy and TENS. In the technical working of medical electrolysis the most minute precautions are required. The solution of the drug must be made with as pure water as possible, recently distilled. The spongy substance forming the electrode must be free from any trace of electrolytic substances. Hence all materials used must be washed in distilled water. Absorbent cotton answers all requirements and is easily procured. The area of introduction can be exactly circumscribed by cutting a hole in a sheet of adhesive plaster which is applied to the skin and on which the electrolytic electrodes are pressed. The great advantage of electrolytic methods is that it enables general treatment to be replaced by a strictly local treatment, and the cells can be saturated exactly to the degree and depth required. Strong an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fleet Street
Fleet Street is a major street mostly in the City of London. It runs west to east from Temple Bar at the boundary with the City of Westminster to Ludgate Circus at the site of the London Wall and the River Fleet from which the street was named. The street has been an important through route since Roman times. During the Middle Ages, businesses were established and senior clergy lived there; several churches remain from this time including Temple Church and St Bride's. The street became known for printing and publishing at the start of the 16th century, and it became the dominant trade so that by the 20th century most British national newspapers operated from here. Much of that industry moved out in the 1980s after News International set up cheaper manufacturing premises in Wapping, but some former newspaper buildings are listed and have been preserved. The term ''Fleet Street'' remains a metonym for the British national press, and pubs on the street once frequented by jo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gray's Inn Road
Gray's Inn Road (or Grays Inn Road) is an important road in the Bloomsbury district of Central London, in the London Borough of Camden. The road begins at the City of London boundary, where it bisects High Holborn, and ends at King's Cross and St. Pancras Station. As the home of the Honourable Society of Gray's Inn, one of England's four Inns of Court, Gray's Inn Road is known as a hub for law and legal professions in London. Similarly, given Bloomsbury's status as the university and scholarly center of London, Gray's Inn Road is home to multiple scholarly institutes, including University College London's Eastman Dental Institute, a world-leading oral health institution, Westminster Kingsway College, and the City University of London's Inns of Court School of Law. Name The thoroughfare is first recorded as ''Purtepol Street'' in the 13th century, when the area formed part of Portpool Manor. After Reginald de Grey, 1st Baron Grey de Wilton purchased the area, his name soo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hatton Garden
Hatton Garden is a street and commercial zone in the Holborn district of the London Borough of Camden, abutting the narrow precinct of Saffron Hill which then abuts the City of London. It takes its name from Sir Christopher Hatton, a favourite of Queen Elizabeth I, who established a mansion here and gained possession of the garden and orchard of Ely Place, the London seat of the Bishops of Ely. It remained in the Hatton family and was built up as a stylish residential development in the reign of King Charles II. For some decades it often went, outside of the main street, by an alternative name St Alban's Holborn, after the local church built in 1861. St Etheldreda's Church in Ely Place, all that survives of the old Bishop's Palace, is one of only two remaining buildings in London dating from the reign of Edward I. It is one of the oldest churches in England now in use for Roman Catholic worship, which was re-established there in 1879. The red-brick building now known as Wr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X-ray
An X-ray, or, much less commonly, X-radiation, is a penetrating form of high-energy electromagnetic radiation. Most X-rays have a wavelength ranging from 10 picometers to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz ( to ) and energies in the range 145 eV to 124 keV. X-ray wavelengths are shorter than those of UV rays and typically longer than those of gamma rays. In many languages, X-radiation is referred to as Röntgen radiation, after the German scientist Wilhelm Conrad Röntgen, who discovered it on November 8, 1895. He named it ''X-radiation'' to signify an unknown type of radiation.Novelline, Robert (1997). ''Squire's Fundamentals of Radiology''. Harvard University Press. 5th edition. . Spellings of ''X-ray(s)'' in English include the variants ''x-ray(s)'', ''xray(s)'', and ''X ray(s)''. The most familiar use of X-rays is checking for fractures (broken bones), but X-rays are also used in other ways. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
High Frequency
High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters). Frequencies immediately below HF are denoted medium frequency (MF), while the next band of higher frequencies is known as the very high frequency (VHF) band. The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio. Because radio waves in this band can be reflected back to Earth by the ionosphere layer in the atmosphere – a method known as "skip" or " skywave" propagation – these frequencies are suitable for long-distance communication across intercontinental distances and for mountainous terrains which prevent line-of-sight communications. The band is used by international shortwave broadcasting stations ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medical And Chirurgical Society Of London
The Medical and Chirurgical Society of London was a learned society of physicians and surgeons which was founded in 1805 by 26 personalities in these fields who had left the Medical Society of London (founded 1773) because of disagreement with the autocratic style of its president, James Sims. Among its founders there were William Saunders (1743–1817), its first president; John Yelloly (1774–1842), Sir Astley Cooper (1768–1841), the first treasurer; Alexander Marcet (1770–1822) and Peter Mark Roget (1779–1869). According to its charter, the Medical and Chirurgical Society of London was founded "for the purpose of conversation on professional subjects, for the reception of communications and for the formation of a library" and served "several branches of the medical profession". In 1834 the Society received a Royal charter, thus becoming the Royal Medical and Chirurgical Society of London. This society merged with several other specialist societies, from 1907 to 1909, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Morgan Cyprian McMahon O'Brien
Morgan Cyprian McMahon O'Brien (1886–1968) was born in New Zealand to Irish parents, and was an engineer and inventor with numerous patents particularly in the area of high-street and bank security, alarm systems, and ciphers. He moved to England in 1925, and patented an advanced cipher typewriter in 1928 which has been referred to as "Britain's Enigma machine, Enigma",Intelligence and Strategy: Selected Essays, John Robert Ferris, Routledge, 2005, , 9780415361958 and just before WW2 he patented the coding device known as the Syko Cipher Device, SYKO cipher device used throughout the war by the allied air forces, and to some extent by the allied navies too. Early life Morgan O'Brien was born in Auckland on September 25, 1886 to Charles O'Brien (proprietor of the Alpha Hotel, Kihikihi) and Elizabeth. Charles was born 1855 in Youghal, County Cork, Ireland and died in 1922 in New Zealand. Although O'Brien finished high in the New Zealand civil service examinations in 1904 aged 17, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photometer
A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum. Most photometers convert light into an electric current using a photoresistor, photodiode, or photomultiplier. Photometers measure: *Illuminance *Irradiance *Light absorption * Scattering of light *Reflection of light *Fluorescence *Phosphorescence *Luminescence History Before electronic light sensitive elements were developed, photometry was done by estimation by the eye. The relative luminous flux of a source was compared with a standard source. The photometer is placed such that the illuminance from the source being investigated is equal to the standard source, as the human eye can judge equal illuminance. The relative luminous fluxes can then be calculated as the illuminance decreases proportionally to the inverse square of distance. A standard example of such a photometer consists of a piece of paper with an o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Industries Fair
The British Industries Fair was an exhibition centre in Birmingham, England. The large complex of buildings was built in 1920 and was situated between Castle Bromwich Aerodrome and the railway line. For two weeks every year it was the most visited attraction in the country. In 1933, the first diesel locomotive arrived for display at the BIF. The final B.I.F was on 6 to 17 May 1957.Birmingham Post 15/5/57 The associated aerodrome, which often showed air displays, closed with the final flight on 31 March 1958. The nearby Castle Bromwich railway station received many important visitors for the BIF, including King George V and Queen Mary in 1928, the Duke of York, Princess Mary and Lord Lascelles. They were often entertained afterwards by the Bradfords at Castle Bromwich Hall. The site was sold in 1960, along with that of the airfield. The buildings and the sites were cleared for the construction of the Castle Vale housing estate. The BIF was replaced by the National Exhibition Ce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alternating Current
Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, fans and electric lamps into a wall socket. A common source of DC power is a battery cell in a flashlight. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', as when they modify ''current'' or ''voltage''. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa. In certain applications, like guitar amplifiers, different waveforms are used, such as triangular waves or square waves. Audio a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
