This timeline was created for the Museum of The San Fernando ValIey and pulls from resources like Calisphere, the Library of Congress, CSUN, personal blogs and a diverse set of publications. Special thanks to Tiffany Do for her research and interest in creating the timeline, and Hillary Jenks and Alexis Moreno for their help in writing the entries.
50,000 a€“ 15,000 BC People of northeast Asia follow herds of caribou, bison & mammoth and migrate across the present day Bering Strait. 1542 Juan Cabrillo claims Southern California territory for the Spanish kingdom, beginning over three and half centuries of occupation. 1822A  Spanish rule in California becomes Mexican rule with the rise of the Republic of Mexico and the country's successful War for Independence from Spain. 1833 The Mexican government secularizes the missions, making them public property and allows for land to be distributed to Indian neophytes and Mexican soldiers as payment for service in the military. 1843 Manuel Micheltorena, governor of southern California, decrees the restoration of southern missions to church control. 1846 Governor Pio Pico sells most of the San Fernando Valley land to Eulogio de Celis before the Mexican War. 1846 - 1848 The Mexican American War results in California becoming part of the United States, along with more than half of former Mexican land.
1847 Agreement of peace (Cahuenga Capitulation) between Fremont and Pico gives Americans control of California in the war.
1849 The gold rush in Northern California draws people, and the Valley is cow country full of ranchos that feed them.
1850 California joins the United States; Los Angeles County (which includes the San Fernando Valley) initially comprises 4,340 square miles and the first United States Census measures its population at 3,530.
1851 Alexander Bell and David Alexander become the first American landowners in the Valley after Vicente de Osa sells Rancho Providencia.
1854 Rancho Ex-Mission de San Fernando falls into hands of Andres Pico who becomes known for his hospitality and entertainment. 1855 A new road allows lines of stages, trains of wagons and pack mules to travel to Kern River gold fields. 1860 Geronimo Lopez’s adobe home becomes known as the Lopez Station for housing the stagehouse for the Valley. 1880 San Fernando Farm Homestead Association officially distributes property to stockholders.
1887 A real estate boom partitions up the Valley, beginning with the Lankershim Ranch Land and Water Company, which buys land from the Los Angeles Farm and Milling Company. 1897 Squatters of the Land Settlers league attempt to squat in the San Fernando Valley under the belief that it is public land for settlement. 1907 Los Angeles approves a 23 million dollar bond issue for aqueduct construction from Owens Valley. In 1915, the city of Los Angeles annexes the San Fernando ValleyA  - a crucial development as this enables the Valley to gain access to the water coming from Owens Valley from the Los Angeles Aqueduct (completed two years earlier under the direction of William Mulholland). 1916 Due to the influx of water provided by the LA Aqueduct, Valley residents begin growing oranges. 1918 The Valley reports record crops including 55,000,000 pounds of beans, and a variety of fruits and vegetables including apricots, citrus, peaches, potatoes, and sugar beets.
1926 The town of Sherman Oaks and the street Sherman Way bear legacy to pioneer of the San Fernando Valley General Moses Hazeltine Sherman. 1931 Residents protest changing the name of Cahuenga to Highland because of the uniqueness of the name Cahuenga. 1941- May 29 Disney Studio animators strike Disney due to Walt Disney's inconsistent monetary rewards for better workers. 1941 When the United States joins World War II, the Valley changes from a place of agriculture to manufacturing as part of the war effort and defense institutions like Lockheed.
1941 Old Trapper’s Lodge Motel with giant trapper sculptures is built as an attraction. 1945 Despite the wartime ban against strikes, set designers from the Conference of Studio Unions strike against Warner Brothers film studio for 30 weeks. 1956 The San Fernando Valley Campus of the Los Angeles State College of Applied Arts and Sciences (CSUN) opens. 1959 Valley leaders and parents protest the increase in mailed pornography in the community.
1966 A coalition of property owning and tax paying associations come together to create a mass group to protest hikes on property taxes. Between 1967 and 1971 there are six massive demonstrations at San Fernando Valley State College (now known as California State University Northridge) against the lack of representation or curricula related to ethnic studies and the war in Vietnam. 1971 The Sylmar Tunnel Disaster strikes when Lockheed Shipbuilding and Construction Company tunnels to bring water from the Feather River to the Los Angeles basin. 1979A  Valley residents march against Rocketdyne’s Canoga Park facility on the anniversary of Hiroshima and Nagasaki bombings to protest the dangerous activities of operations involving nuclear energy. 1991 Motorist Rodney King is pulled over on Foothill Boulevard in Lake View Terrace where 15 LAPD officers in patrol cars converged on him. 1992 The Rodney King trial takes place in Simi Valley with a jury of ten whites, one Latino, and one Asian.
1994 a€“ 57 people lose their lives in the wake of the 6.7 magnitude Northridge Earthquake. 1996 Unrest occurs at California State University Northridge when Ku Klux Klan leader David Duke speaks on campus.
Hard X-rays can penetrate solid objects, and their largest use is to take images of the inside of objects in diagnostic radiography and crystallography.


The roentgen (R) is an obsolete traditional unit of exposure, which represented the amount of radiation required to create one electrostatic unit of charge of each polarity in one cubic centimeter of dry air. The rad is the (obsolete) corresponding traditional unit, equal to 10 millijoules of energy deposited per kilogram.
The sievert (Sv) is the SI unit of equivalent dose, which for X-rays is numerically equal to the gray (Gy). X-rays are generated by an X-ray tube, a vacuum tube that uses a high voltage to accelerate the electrons released by a hot cathode to a high velocity.
In crystallography, a copper target is most common, with cobalt often being used when fluorescence from iron content in the sample might otherwise present a problem.
X-ray fluorescence: If the electron has enough energy it can knock an orbital electron out of the inner electron shell of a metal atom, and as a result electrons from higher energy levels then fill up the vacancy and X-ray photons are emitted.
So the resulting output of a tube consists of a continuous bremsstrahlung spectrum falling off to zero at the tube voltage, plus several spikes at the characteristic lines. In medical diagnostic applications, the low energy (soft) X-rays are unwanted, since they are totally absorbed by the body, increasing the dose. To generate an image of the cardiovascular system, including the arteries and veins (angiography) an initial image is taken of the anatomical region of interest. A specialized source of X-rays which is becoming widely used in research is synchrotron radiation, which is generated by particle accelerators.
The most commonly known methods are photographic plates, photographic film in cassettes, and rare earth screens. Before the advent of the digital computer and before invention of digital imaging, photographic plates were used to produce most radiographic images.
Since photographic plates are sensitive to X-rays, they provide a means of recording the image, but they also required much X-ray exposure (to the patient), hence intensifying screens were devised.
Areas where the X-rays strike darken when developed, causing bones to appear lighter than the surrounding soft tissue. Contrast compounds containing barium or iodine, which are radiopaque, can be ingested in the gastrointestinal tract (barium) or injected in the artery or veins to highlight these vessels. An increasingly common method is the use of photostimulated luminescence (PSL), pioneered by Fuji in the 1980s. The PSP plate can be reused, and existing X-ray equipment requires no modification to use them.
For many applications, counters are not sealed but are constantly fed with purified gas, thus reducing problems of contamination or gas aging. Some materials such as sodium iodide (NaI) can "convert" an X-ray photon to a visible photon; an electronic detector can be built by adding a photomultiplier. They move south along ice-fee corridors into the North American continent to what is now California. With him are two Franciscan padres, Junipero Serra and Juan Crespi, who record the expedition and found the first mission.
Of the missions’ eight million acres originally designated as the property of converted Native Americans, 500 land grants are created for influential families.
Though the Treaty of Guadalupe Hidalgo formally ends the war, it becomes an issue of contention when existing Californio rights are not honored as promised, and the Treaty is breached. The treaty takes place at the house of Don Feliz (Campo de Cahuenga) near the Cahuenga Pass. His adobe house eventually becomes state historical monument: Los Encinos State Historical Park. This pamphlet extolls the benefits of living in Southern California in order to be healed of many diseases like tuberculosis.
Los Angeles Farm and Milling Company, the successor to the Homestead Association, promotes wheat and flour-milling industry.
Going back to Native American terms, the word Cahuenga reflects the Native American origins of the San Fernando Valley.
Phyllis O’Kray from the crash of a jet plane, Valley residents picket Lockheed Aircraft Corporation in Van Nuys to abolish the use of the San Fernando Valley for jet flying. This will be the third institution of higher education founded in the Valley; in 1947 Pierce College is founded and in 1949 Valley College opens. Murrow televises the Sodium Reactor Experiment from the Santa Susana Research Facility on his program as it powered Moorpark.
Although safety inspector Wally Zavattero discovers hazardous conditions and orders precautions taken, they are ignored, leading to an explosion that killed 17 people. Protesting for equality, the senior citizens gather at the Van Nuys-Sherman Oaks Recreation Center to band together. A local resident videotapes the beating, which becomes a national discussion on police brutality.
With twenty billion dollars in damage, it is one of the costliest natural disasters in United States history.
If the 300 square mile area that is the Valley were a single city, it would be the 5th largest in the nation. This process produces an emission spectrum of X-ray frequencies, sometimes referred to as the spectral lines.
The intensity of the X-rays increases linearly with decreasing frequency, from zero at the energy of the incident electrons, the voltage on the X-ray tube. A second image is then taken of the same region after iodinated contrast material has been injected into the blood vessels within this area. The contrast compounds have high atomic numbered elements in them that (like bone) essentially block the X-rays and hence the once hollow organ or vessel can be more readily seen.


In modern hospitals a photostimulable phosphor plate (PSP plate) is used in place of the photographic plate. The Sacred Expedition is a religious & military project of missionization and colonization on behalf of Spain.
Using Native American workers to not only construct the mission but also work it, the mission quickly becomes one of the most prosperous in California, producing abundant harvests and goods. Unknown to his readers, Nordhoff is paid by the Southern Pacific Railroad to praise the curative nature of the region’s climate. The dam is approximately 200 feet high in San Francisquito Canyon, about 5 miles northeast of what is now Magic Mountain. Photographs at right by Dorothea Lange of the San Fernando Valley in 1936, care of the Library of Congress. Producers pelt metal nuts and bolts from the roof and police hose workers and throw tear gas. In July the Sodium Reactor Experiment suffers a partial meltdown; its estimated release is 240 times that of 3 Mile Island. Until now, there has been no one museum or institution to document, preserve, and celebrate the full scope of the collective history, culture, and arts of such an important place until the 2005 incorporation of The Museum of the San Fernando Valley. The spectral lines generated depend on the target (anode) element used and thus are called characteristic lines.
These two images are then digitally subtracted, leaving an image of only the iodinated contrast outlining the blood vessels.
Photographic film largely replaced these plates, and it was used in X-ray laboratories to produce medical images. In the pursuit of a non-toxic contrast material, many types of high atomic number elements were evaluated. After the plate is X-rayed, excited electrons in the phosphor material remain "trapped" in "colour centres" in the crystal lattice until stimulated by a laser beam passed over the plate surface. Electrons accelerate toward the anode, in the process causing further ionization along their trajectory. The mix of agrarian and industrial life at this early stage in the Valley’s history sets a precedent for the future economy of the Valley as a pastoral region with some areas of industry. But the taking of this water destroys the environment and the economy of the Owens Valley, once a beautiful valley known for its migrating birds and diverse, self-sustaining ecosystems. The dam fails upon its first full filling on March 12, killing 450 people in the San Francisquito and Santa Clara River valleys. The radiologist or surgeon then compares the image obtained to normal anatomical images to determine if there is any damage or blockage of the vessel. In more recent years, computerized and digital radiography has been replacing photographic film in medical and dental applications, though film technology remains in widespread use in industrial radiography processes (e.g.
For example, the first time the forefathers used contrast it was chalk, and was used on a cadaver's vessels. This process, known as a Townsend avalanche, is detected as a sudden current, called a "count" or "event".
When the film is developed, the parts of the image corresponding to higher X-ray exposure are dark, leaving a white shadow of bones on the film.
Senator Maclay goes to the County Recorder in Los Angeles and creates the City of San Fernando (township) through a map of development plans. This bloody event leads to the passage of the 1947 Taft Hartley Act, which severely restricts workers’ abilities to strike and the power of unions. Additional fuel-element handling accidents occurred during the recovery process that resulted in radiological releases to the environment and surrounding communities.
Photographic plates are mostly things of history, and their replacement, the "intensifying screen", is also fading into history. The metal silver (formerly necessary to the radiographic & photographic industries) is a non-renewable resource. Thus it is beneficial that this is now being replaced by digital (DR) and computed (CR) technology. Where photographic films required wet processing facilities, these new technologies do not.
Upon hearing the verdict, hundreds of Los Angelenos begin a protest that turns into a a€?livea€? televised six-day riot where 53 people die and the total cost of damages equals $1,000,000,000. The mix of agrarian and industrial life at this early stage in the Valleya€™s history sets a precedent for the future economy of the Valley as a pastoral region with some areas of industry. Unknown to his readers, Nordhoff is paid by the Southern Pacific Railroad to praise the curative nature of the regiona€™s climate. Many singers record Jenkinsa€™ song including Bing Crosby (whose version hits #1 on Billboard Magazinea€™s chart in 1944) and the King Sisters; the publicity helps build a population explosion. The Westerns a€?Bells of San Fernandoa€? and the Western a€?San Fernando Valleya€? are released. Phyllis Oa€™Kray from the crash of a jet plane, Valley residents picket Lockheed Aircraft Corporation in Van Nuys to abolish the use of the San Fernando Valley for jet flying. Welcome to a Timeline of the San Fernando Valley This timeline was created for the Museum of the San Fernando ValIey and pulls from resources like Calisphere, the Library of Congress, CSUN, personal blogs and a diverse set of publications.
Until now, there has been no one museum or institution to document, preserve, and celebrate the full scope of the collective history, culture, and arts of such an important place until the 2005 incorporation of The Museum of the San Fernando Valley.This timeline was created for the Museum of The San Fernando ValIey and pulls from resources like Calisphere, the Library of Congress, CSUN, personal blogs and a diverse set of publications.



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