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$hell on Earth: From Browser to System Compromise
Segment 1 (PPNO 4153): In Santa Fe Springs from North Fork Coyote Creek Overcrossing to Marquardt Avenue. Construct one HOV lane and one mixed-flow lane in each direction; reconstruct the Alondra Avenue/North Fork Coyote Creek Bridges and adjacent frontage roads. ($109,520,000)
The portion of Route 5 between the Pit River Bridge in Shasta County and theShasta-Siskiyou County line is officially designated the "". In the decade of the Gold Rush, miners, farmers, andmerchants of the Counties of Shasta and Siskiyou were unable to communicatewith the outside world or bring their produce to market except over dangerouspack trails due to the rugged terrain in the Sacramento River Canyon. Afterother wagon road building efforts failed, Elias B. Stone and his sons secured astate franchise to build a wagon road. With brawn, black powder, mules, andoxen, the Stone family built nine bridges across the Sacramento River, 15bridges across creeks and gulches, and a narrow road notched into theSacramento River Canyon's walls, running 43 miles, from the Siskiyou-Shastacounty line to the Stone family's ferry boat and landing on the Pit River, afew miles above that river' s junction with the Sacramento River. The Stonefamily completed the Stone Turnpike in the Sacramento River Canyon in 1861, butafter only a few months of collecting tolls, disaster, in the form of the worstwinter storm known in the area to that time, destroyed most of their work. TheStone family mortgaged all of its property and rebuilt a better toll roaddespite several legal entanglements. Other parties finally gained full controlof the Stone family's company and the Stone Turnpike in 1868. In the 1870s, theStone Turnpike became the major north to south stage route to Oregon; in 1887,the steel rails of the Central Pacific Railroad displaced the Stone Turnpike insome sections to complete the rail link into southern Oregon. In 1915, thedusty old stage road became Shasta County's part of the ,the predecessor of US , which is now I-5. Named by Assembly ConcurrentResolution No. 94, Chapter 98, in 1994.
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The Wheatstone Bridge could not only measure an unknown R value, if an AC voltage was applied to the bridge circuit, capacitive or inductive reactance could be measured. From the Xc or Xl, the actual unknown value of the component could be calculated. Since reactance is what is actually being measured, this application of the bridge was usually called an "Impedance Bridge." Early Impedance Bridges used mechanical oscillators that were something like buzzers and would work with a DC voltage, creating an oscillating voltage. Early Bridges used separate devices to connect a voltage source to separate resistive components and to the galvanometer to complete the bridge circuit. By the early twentieth century, Bridges were available as a complete test instrument although most required separate potential source and galvanometer. Later Impedance Bridges would have all components built-in with an AC line operated power supply for the potential source for DCR measurements and a built-in electron tube oscillator for Z measurements.
So, what's a "Vacuum-Tube Fork?" It's an electro-mechanical, fixed-frequency oscillator that has its frequency generation based on a precision tuning fork that is driven by a vacuum-tube circuit that places grid and plate driving-pick-up coils that surround said tuning fork. Since the frequency is determined by the physical dimensions of the tuning fork, the accuracy of the frequency produced is +/- .05%. Output Z is selectable at 50Ω, 500Ω or 5000Ω. The output can deliver about 50mw into a matched load. The VT Fork has a built-in AC power supply that uses a selenium bridge rectifier and a voltage regulator. The power supply is removable as a unit and batteries can be installed if portable field work is to be performed. The wooden front panel is removable to allow access to the power supply. Two tubes are used - one 1A5GT and one 0C3. Two types of VT Forks were available, the C version providing 1000hz output and the D version providing 400hz output. The VT Fork was used where a very accurate and stable fixed-frequency was required. This might have been as an external modulation source for an RF signal generator, or as a generator for precision measurements using various types of Z bridges or as a Tone generator for communications systems or for beacon transmitters. Original 1951 selling price was $165.
See also the variable org-insert-mode-line-in-empty-file
Precision potentiometers were used in conjunction with sensitive galvanometers and usually with a Weston Standard Cell (or similar Standard Cell) to provide a method to measure very low voltages. Used in various hook-ups a variety of measurements were possible although some had to be calculated from other data. Early designs used straight length resistance rods but these proved to be difficult to handle and store. The idea of using a resistance wire coil that was wound in a spiral configuration saved a lot of room and allowed for better portability. The maximum voltage that could be measured was usually around 1.8vdc but special external precision resistors could be connected to increase the voltage limits. The galvanometers used with Type K potentiometers was usually a sensitive device that used a mirror mounted to the moving coil and a light source. A shadow-graph scale was at one end of the galvanometer allowing very sensitive measurements to be made There are several binding posts on the rear of the Type K potentiometer to allow connecting various instruments, i.e., the Std. Cell, the galvanometer, external EMF inputs, etc. The controls on the right side of the potentiometer are for "rough" R adjustments and then the large drum is turned to fine adjust the potentiometer. The scale on the drum dial appears to change as the potentiometer arm and drum rides up the resistance wire spiral. The 0-100 scale of the drum is read through the window that has 10 levels shown giving resolution of 1000 (100 x 10) for the span of the potentiometer. Switches allow for selecting either an external Std. Cell for source voltage or for connecting an external source of EMF that could be used by the potentiometer. Also, there is a control to compensate for slight changes in the Std. Cell output. Scaling can be selected via the voltage switch.
Shown to the right is the General Radio Company Type 650-A Impedance Bridge. When battery operated, a mechanical oscillator called a "hummer" was used. This device used the battery supplied DC voltage to cause a small pendulum to mechanically vibrate and that was picked-up by a carbon microphone inside the unit. The output was sufficient to drive a hi-Z headset. Early versions were battery only operation but in the late-forties, the 650-PI was introduced. The Type 650-PI eliminated the need for the hummer and an electron tube oscillator (1kc) was used in its place. The amplifier gave higher output levels for better detection of the null by listening to the headset. Most of the voltages provided by the 650-PI are for its oscillator and amplifier. The DC voltage provided for the DCR measurements is a substantially higher (~180vdc) than that provided with battery operation. This results in better accuracy at higher resistances. The 650-A shown to the right has the 650-PI installed. The solid walnut case is lined with copper sheet for full shielding. Selling price in the early fifties was $410 with the 650-PI installed and $260 if the battery operated version was desired. The 650-PI by itself was available for $150.
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Saying Goodbye: 5 Alternatives To The Optical Disc
Segment 3 (PPNO 4154): In Norwalk, from Shoemaker Avenue Bridge to Silverbow Avenue Overcrossing. Construct one HOV lane and one mixed-flow lane in each direction; reconstruct the Silverbow Pedestrian Overcrossing, three bridges and adjacent frontage roads. ($214,421,000)
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In August 2011, the CTC updated the schedule for this project, which willadd one HOV lane and one mixed flow lane in each direction on the I-5 mainlinefreeway, reconstruct Alondra Avenue bridge, Alondra Avenue/North Fork CoyoteCreek bridge, and reconstruct adjacent frontage roads. This project wasoriginally planned to be ready for advertisement in March 2011. However,difficulties in obtaining necessary federal and county permits for the project,including right of entry permits to conduct hazardous waste investigations,delayed the project baseline design, R/W and construction milestones. In March2012, it was reported that construction was about to begin on the $110 millionproject. The Alondra Boulevard Bridge Project is expected to be completed bymid-2015.
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Segment 2 (PPNO 2808): In La Mirada, Santa Fe Springs and Cerritos, from the County Line (Artesia Boulevard) to Coyote Creek. Construct one HOV lane and one mixed-flow lane in each direction; reconstruct Valley View Avenue Interchange, Coyote Creek Bridge and adjacent frontage roads. ($416,204,000)
Vintage Test Equipment - Great Basin
The on Route 3 in the County of Siskiyou (003SIS 9.75) is officially named the "".This bridge was named in honor of Erling Hjertager, an exceptionally generousindividual who continuously and unreservedly contributed to the community ofScott Valley over a period of fifty years. He donated their time and capital tothe community of Scott Valley in times of dire need and emergency. ErlingHjertager was known to personally fly individuals, at a moments notice and freeof charge, to San Francisco that were in need of medical attention. ErlingHjertager was a successful entrepreneur and owner of a sawmill that employedmany in the County of Siskiyou and provided an incredible amount of lumber tothe World War II effort. Erling Hjertager was a true community leader thatheaded the Boy Scouts, sponsored local basketball teams, lead the Masonicsociety, anonymously donated to numerous charities, and delivered wood to theelderly during the winter season. Named by Assembly Concurrent Resolution (ACR)108, Resolution Chapter 84, on 07/11/2006.
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