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A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit.
Rolleiflex medium format cameras continued to be produced by DHW Fototechnik up to 2014—a company founded by former Franke & Heidecke employees. [3] DHW Fototechnik announced two new Rolleiflex cameras and a new electronic shutter for photokina 2012. [4]
Rollei was a German company that established a worldwide reputation with the Rolleiflex, a twin-lens reflex camera.. Rollei was founded in 1920 as the Werkstatt für Feinmechanik und Optik, Franke & Heidecke in order to make a twin-lens reflex camera.
Prior to the 1960s, a pressure switch was used in the hydraulic braking circuit to control power to the brake lights; more recent automobiles use a switch directly activated by the brake pedal. In dust control systems (bag filter), a pressure switch is mounted on the header which will raise an alarm when air pressure in the header is less than ...
A variation of the centrifugal switch used a changeover contact to ensure that the auxiliary windings remain in the circuit through a running capacitor. These motors are called two-value or capacitor start capacitor run motors. Centrifugal switches are found in many clothes dryers, supplying power to the motor in parallel with the start switch ...
An analogue switch: Maxim MAX313. An analogue switch, also called a bilateral switch, is an electronic component that behaves in a similar way to a relay, but has no moving parts. The switching element is normally a pair of MOSFET transistors, one an N-channel device, the other a P-channel device. The device can conduct analog or digital ...
Grace and Frankie is an American comedy television series that premiered on Netflix on May 8, 2015. [1] The series was created by Marta Kauffman and Howard J. Morris and stars Jane Fonda and Lily Tomlin as Grace and Frankie, two women whose lives change when their husbands announce that they are in love with each other and want to marry.
[316] [317] On 14 March, the annual IQAir World Air Quality Report that uses a sensor network suggests of the countries assessed, [quantify] six countries may have met [contradictory] the WHO guideline specific to this type of air pollution. [318] Air pollution is one of the largest causes of early deaths.