These theoretical relationships are more clearly illustrated in Fig. 7 and their sum can be seen to correlate in form with practical measurements made with the Hesiometer as illustrated in the first portion of Fig. 5 for the cutting mechanism.

" In practical terms, the most important law in the code may well be the very first: " We enjoin, what is most necessary, that each man keep carefully his oath and his pledge ," which expresses a fundamental tenet of Anglo-Saxon law.

Anthemius assumes a property of an ellipse not found in Apollonius's work, that the equality of the angles subtended at a focus by two tangents drawn from a point, and having given the focus and a double ordinate he goes on to use the focus and directrix to obtain any number of points on a parabola — the first instance on record of the practical use of the directrix.

This word was first used by Robert Blair ( d. 1828 ), professor of practical astronomy at Edinburgh University, to characterize a superior achromatism, and, subsequently, by many writers to denote freedom from spherical aberration.

Though the Lind was not the first it was the most practical and best known anemometer of this type.

While it is not recorded as a " steal ", in a practical sense a batter can be said to " steal first base " by successfully running to first base ( without being tagged or thrown out ) in rare circumstances following an uncaught third strike ; the rarely-seen play avoids an " out " and gains a baserunner.

In 1888, Scotsman John Boyd Dunlop introduced the first practical pneumatic tire, which soon became universal.

In 1949, he erected his first geodesic dome building that could sustain its own weight with no practical limits.

The second partial ( first overtone ) is the lowest note of each tubing length practical to play on half-tube instruments.

* Willem Einthoven ( 1860 – 1927 ), a physiologist who built the first practical ECG and won the 1924 Nobel prize in medicine

TFI's founder and prophetic leader, David Berg, who was first called " Moses David " in the Texas press, communicated with his followers via Mo Letters — letters of instruction and counsel on myriad spiritual and practical subjects — until his death in late 1994.

On a practical basis, Berthollet was the first to demonstrate the bleaching action of chlorine gas, and was first to develop a solution of sodium hypochlorite as a modern bleaching agent.

In 1983, using the psychoacoustic principle of the masking of critical bands first published in 1967, he started developing a practical application based on the recently developed IBM PC computer, and the broadcast automation system was launched in 1987 under the name Audicom.

" Early detective stories tended to follow an investigating protagonist from the first scene to the last, making the unraveling a practical rather than emotional matter.

* 1947 – William Shockley, John Bardeen and Walter Brattain build the first practical point-contact transistor.

Proponents of moral science like Ronald A. Lindsay have counter-argued that their way of understanding " morality " as a practical enterprise is the way we ought to have understood it in the first place.

The zinc-manganese dioxide dry cell was the first portable, non-spillable battery type that made flashlights and other portable devices practical.

The lead acid battery was the first practical secondary ( rechargeable ) battery that could have its capacity replenished from an external source.

This practical eminence of Constantinople in the East is evident, first at the First Council of Constantinople 381, and then ecumenically at the Council of Chalcedon in 451.

As a result of the work of Étienne-Jules Marey and Eadweard Muybridge, many researchers in the late 19th century realized that films as they are known today were a practical possibility, but the first to design a fully successful apparatus was W. K. L. Dickson, working under the direction of Thomas Alva Edison.

In 1893 at the Chicago World's Fair, Thomas Edison introduced to the public two pioneering inventions based on this innovation ; the Kinetograph – the first practical moving picture camera – and the Kinetoscope.

* ADA collider, the first electron – positron collider

In the first reaction a fluoride ion, F < sup >−</ sup >, gives up an electron pair to boron trifluoride to form the product tetrafluoroborate.

The quantum number n first appeared in the Bohr model where it determines the radius of each circular electron orbit.

Synthetic amethyst is produced by gamma-ray, x-ray or electron beam irradiation of clear quartz which has been first doped with ferric impurities.

The word " electron " was coined in 1891 by the Irish physicist George Stoney whilst analyzing elementary charges for the first time.

Paul Drude proposed the first theoretical model for a classical electron moving through a metallic solid.

In 1927, the first mathematically complete quantum description of a simple chemical bond, i. e. that produced by one electron in the hydrogen molecular ion, H < sub > 2 </ sub >< sup >+</ sup >, was derived by the Danish physicist Oyvind Burrau.

In this paper, elaborating on the works of Lewis, and the valence bond theory ( VB ) of Heitler and London, and his own earlier works, Pauling presented six rules for the shared electron bond, the first three of which were already generally known:

In the first case, the bond is divided so that each product retains an electron and becomes a neutral radical.

Therefore they were not atoms, but a new particle, the first subatomic particle to be discovered, which he originally called " corpuscle " but was later named electron, after particles postulated by George Johnstone Stoney in 1874.

Mulliken proposed that the arithmetic mean of the first ionization energy ( E < sub > i </ sub >) and the electron affinity ( E < sub > ea </ sub >) should be a measure of the tendency of an atom to attract electrons.

Coated pits and vesicles were first seen in thin sections of tissue in the electron microscope by Matt Lions and Parker George.

The " ground state ", i. e. the state of lowest energy, in which the electron is usually found, is the first one, the 1s state ( principal quantum level n

After the development of his electron capture detector, in the late 1960s, Lovelock was the first to detect the widespread presence of CFCs in the atmosphere.

Ernst Ruska started development of the first electron microscope in 1931 which was the transmission electron microscope ( TEM ).

Ernst Ruska, working at Siemens developed the first commercial transmission electron microscope and major scientific conferences on electron microscopy started being held in the 1950s.

In 1965 the first commercial scanning electron microscope was developed by Professor Sir Charles Oatley and his postgraduate student Gary Stewart and marketed by the Cambridge Instrument Company as the " Stereoscan ".

Here the last product means that a first electron, r < sub > 1 </ sub >, is in an atomic hydrogen-orbital centered at the second nucleus, whereas the second electron runs around the first nucleus.

After first observing it under his microscope, he termed the structure the internal reticular apparatus.

* Musoptin. com, microscope objectives: as they were used by Robert Koch for his first photos of microorganisms ( 1877 – 1878 )

Bacteria and microorganisms were first observed with a microscope by Antonie van Leeuwenhoek in 1676, initiating the scientific field microbiology.

There are many types of microscopes, the most common and first to be invented is the optical microscope which uses light to image the sample.

The first microscope to be developed was the optical microscope, although the original inventor is not easy to identify.

The first detailed account of the interior construction of living tissue based on the use of a microscope did not appear until 1644, in Giambattista Odierna's L ' occhio della mosca, or The Fly's Eye.

The first was the scanning tunneling microscope in 1981, developed by Gerd Binnig and Heinrich Rohrer.

It was not until 1978 when Thomas and Christoph Cremer developed the first practical confocal laser scanning microscope and the technique rapidly gained popularity through the 1980s.

The most common type of microscope ( and the first invented ) is the optical microscope.

Minsky's inventions include the first head-mounted graphical display ( 1963 ) and the confocal microscope ( 1957, a predecessor to today's widely used confocal laser scanning microscope ).

Antonie van Leeuwenhoek, the first microbiologist and the first to observe microorganisms using a microscope

Antonie Van Leeuwenhoek ( 1632 – 1723 ) was one of the first people to observe microorganisms, using a microscope of his own design, and made one of the most important contributions to biology.