Above is a "Lifegaurd" brand lamp by Westinghouse, it needs a ballast to run. UV rays are produced, but blocked by the borosilicate glass.
There are several versions of the lamp but the basic principle is the same. The first mercury vapor lamps were in a lower pressure tube. One would tip the lamp, and electrical contacts on each side of the lamp would send electricity through a liquid mercury which started the lamp. After that the lamp would heat fast and mercury became a vapor.
The light would intensify as the arc grew stronger in the tube. Lamps of today are high pressure lamps with a fused quartz inner discharge tube. The high pressure helps increase efficiency and this was developed in35 years after the low pressure lamps came out.
This lamp start with a small arc between the starting electrode and the main electrode. This arc goes through argon gas which easily strikes, even in cold weather. This little arc heats the tube, and over several minutes the tube gets hot enough to vaporize the solid mercury stuck to the sides.
The mercury vaporized creates a strong light between the two main electrodes. Some lamps are "Self Ballasted", they use an incandescent filament to act as a resistor, limiting current. Home lighting fixtures usually use the self-ballasted type where as the more expensive but more efficient ballasted lamps are found in large fixtures for municipal lighting.
The photo below shows a self-ballasted lamp, notice the tungsten filament. In this clear bulb zinc and cadmium are metals used along with the mercury to help color and brightness.
A Mercury Vapor with a transformer ballast build into the base. The bulb at left is just warming up, the bulb at right is after a few minutes of warming. This bulb has phosphor to help make the light more of a true white color.
It can take several minutes to warm up. Inventors - Tested mercury vapor arcs in air at common atmosphere Charles Wheatstone London worked with arcs through mercury during this tests in spectropy.
He would create an arc through a metal, then observe what colors it produced when a prism separated the light into it's individual frequencies. He tested them on the Hammersmith Bridge in London.Jun 05, · We were able to harvest 2 1/4 gallons of cilantro leaves (coriander) today.
Cilantro is a delicious annual herb, member of the parsley family, and an essential ingredient in our diet that we use weekly in various salsa, quesadilla, and veggie burger plombier-nemours.com: Mr.
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Less than 10% of urban dwellers had an indoor toilet. In , at the establishment of a civilian government, about 37% of all housing units were cement or brick roofed with asbestos or corrugated iron; 34% were mud plastered with cement and roofed with corrugated iron. Touring and Outdoor Activities.
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UVB rays are found in both indoor tanning (bulbs) and outdoor sun exposure (sun rays); years ago, due to lack of knowledge of skin damage caused by tanning, there were more UVB bulbs in tanning beds.