The first mainframe computers, using firstly vacuum tubes and later transistors in the logic circuits, appeared in the 1940s and 1950s.

The first-generation 700s were based on vacuum tubes, while the later, second-generation 7000s used transistors.

In March 1917, Tsar Nicholas II abdicated his throne and a provisional government quickly filled the vacuum, proclaiming Russia a republic months later.

The name triode appeared later, when it became necessary to distinguish it from other generic kinds of vacuum tubes with more or fewer elements ( e. g. diodes, tetrodes, pentodes, etc .).

Democritus, and later philosophers — most notably Leucippus — proposed that the universe was composed of indivisible atoms moving through void ( vacuum ).

He would later go on to help refine the triode vacuum tube.

Nevertheless, as a result a power vacuum was created in Central Europe-especially after Poděbrady himself died later that same year.

The company later added portable vacuum cleaners to its line of cleaning tools.

In later patent litigation, Judge Augustus Hand ruled that Thurman " does not appear to have attempted to design a vacuum cleaner, or to have understood the process of vacuum cleaning ".

Circuits using thermionic valves ( vacuum tubes ) were relatively large, relatively simple ( the number of large, hot, expensive devices which needed replacing was minimised ), and used large sockets, all of which made the PCB less obviously advantageous than with later complex semiconductor circuits.

This lowered the cost of core to the point where it became largely universal as main memory by the early 1960s, replacing both inexpensive low-performance drum memory and costly high-performance systems using vacuum tubes, and later transistors, as memory.

The other gameplay ideas, such as ghosts and the ghost-sucking vacuum cleaner, were added later.

Thousands of variations of the tetrode design, as well as its later development the pentode, have been manufactured since then, although vacuum tubes in low-power equipment have been almost totally superseded by solid-state semiconductor devices.

In his later career Moore developed a miniature neon lamp that was extensively used in electronic displays, as well as vacuum tubes that were used in early television systems.

He simulated the effect using a " terrella ," a sphere in a vacuum tank to which he directed beams of cathode rays, later identified as electrons, and found they indeed produced a glow in regions around the poles of the terrella.

The process of cooling and creating the vacuum was fairly slow, so Savery later added an external cold water spray to quickly cool the steam.

A year later, he remarked that " the greatest vacuum in American politics is to the right of Ronald Reagan.

However, the same power vacuum that enabled the Jewish state to be recognized by the Roman Senate c. 139 BCE was later exploited by the Romans themselves.

The need for the normal ordering of particle fields in the vacuum can be interpreted by the idea that a pair of virtual particles may briefly " pop into existence ", and then annihilate each other a short while later.

Nevertheless, by anticipating the existence of the vacuum, later to be demonstrated on Earth by his collaborator Evangelista Torricelli, Galileo was able to initiate the future science of mechanics.

The history of computing hardware starting at 1960 is marked by the conversion from vacuum tube to solid state devices such as the transistor and later the integrated circuit.

The band originally called themselves Hoover, but later changed their name to Hooverphonic after discovering other groups were already using the Hoover name and to avoid any legal issues with the vacuum cleaner company.

Arthur Wightman showed that the vacuum expectation value distributions, satisfying certain set of properties which follow from the axioms, are sufficient to reconstruct the field theory — Wightman reconstruction theorem, including the existence of a vacuum state ; he did not find the condition on the vacuum expectation values guaranteeing the uniqueness of the vacuum ; this condition, the cluster property, was found later by Res Jost, Klaus Hepp, David Ruelle and Othmar Steinmann.

These effects can be overcome by the addition of a screen grid, however in the later years of the tube era, constructional techniques were developed that rendered this ' parasitic capacitance ' so low that triodes operating in the upper VHF bands became possible.

Poirot later became smitten with the woman and allowed her to escape justice.

He later spoke out for black suffrage, though not based solely on race, but rather merit oriented, arguing, " The better class of them will go to work and sustain themselves, and that class ought to be allowed to vote, on the ground that a loyal Negro is more worthy than a disloyal white man.

The amended terms allowed former members of multiple societies which merge into one to maintain multiple entitlements to FSCS protection until 30 September 2009 ( later extended to 30 December 2010 ), so ( for example ) a member with £ 50, 000 in each of Nationwide, Cheshire and Derbyshire at the time of the respective mergers would retain £ 150, 000 of FSCS protection for their funds in the merged Nationwide.

This fact allowed for later energy release which leads to intermediate-sized element formation in our time.

In an early " good-will " gesture that was later heavily criticised, the Attlee government allowed the Soviets access, under the terms of a 1946 UK-USSR Trade Agreement, to several Rolls-Royce Nene jet engines.

The advent of magnetic devices, such as the compass and much later, magnetic storage devices, allowed for the creation of far more accurate maps and the ability to store and manipulate them digitally.

Although the Cowboys finished the 1989 season with a 1 – 15 record, their worst in almost 30 years, " The Trade " later allowed Dallas to draft a number of impact players to rebuild the team.

Jones later stated, in Tiger Beat magazine, " I kept my marriage a secret because I believe stars should be allowed a private life.

SOE later apologized for interfering, reset, and allowed the players to retry the encounter.

However, the availability of a back catalogue of films on video also allowed for a different relationship between the viewer and an individual film, while private TV channels brought new money into the film industry and provided a launch pad from which new talent could later move into film.

Economist Thomas DiLorenzo suggests that this experience was crucial to Bastiat's later work since it allowed young Frédéric to acquire first-hand knowledge of how regulation can affect markets.

In agriculture the crofters were liberated from the control of the landowners at the beginning of the war, but they were allowed only a right of containment of the farms under the plans of a later general socialization in the country.

Unlike the later Gilbert and Sullivan works, it was hastily prepared, and its nature was more risqué, like Gilbert's earlier burlesques, with a broader style of comedy that allowed for improvisation by the actors.

General Tiburcio Carías Andino was elected in 1932, he later on called a constituent assembly that allowed him to be reelected, and his rule became more authoritarian until an election in 1948.

They later had two children, Andromache and Agamemnon Schliemann ; he reluctantly allowed them to be baptized, but solemnized the ceremony in his own way by placing a copy of the Iliad on the children's heads and reciting one hundred hexameters.

Significant internal reforms were introduced during the later part of the 18th century, but the reform process was not allowed to run its course, as the Russian Empire, the Kingdom of Prussia and the Austrian Habsburg Monarchy through a series of invasions and partitions terminated the Commonwealth's independent existence in 1795.

In response to Cypriot fears that the Jews would never leave ( since they lacked a state or documentation ) the British later allowed the refugees to enter Palestine at a rate of 750 per month.

Single-sourcing the 386 allowed Intel greater control over its development and substantially greater profits in later years.

Two years later, in 1927, the Mausoleum of Mevlana in Konya was allowed to reopen as a Museum.

Brewster later believed he would make money from this popular invention ; however, a fault in his patent application allowed others to copy his invention.

# Larry is allowed to change his mind about any matter at a later date, regardless of whether he previously invoked Rule 1.

While in the beginning only Pashtuns were allowed to participate in the Jirgas, later other ethnic groups like Tajiks and Hazaras were allowed to participate as well, however they were little more than observers.

An alternate, later facility was called DEFMACRO, a system that allowed programmers to specify source-to-source transformations that were applied before the program is run.

Combat is turn-based, though the later games allowed the player to choose to conduct combat in real time.