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The dress was black and blue, but the conditions of the photograph caused many to perceive it as white and gold, creating debate. Within a week, more than ten million tweets had mentioned the dress. The retailer of the dress, Roman Originals, reported a surge in sales and produced a one-off version in white and gold sold for charity.
A 175-watt mercury-vapor light approximately 15 seconds after starting. A closeup of a 175-W mercury-vapor lamp. The small diagonal cylinder at the bottom of the arc tube is a resistor which supplies current to the starter electrode. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce ...
Peter Cooper Hewitt (May 5, 1861 – August 25, 1921) was an American electrical engineer and inventor, who invented the first mercury-vapor lamp in 1901. [1] Hewitt was issued U.S. patent 682,692 on September 17, 1901. [2] In 1903, Hewitt created an improved version that possessed higher color qualities which eventually found widespread ...
During a Hindu wedding, the mangalasutra is tied around the neck of the bride by the groom. The ceremony is known as the Mangalya Dharanam ( Sanskrit for 'wearing the auspicious'). Mangalasutra literally means "an auspicious thread" [ 1 ] that is knotted around the bride's neck and is worn by her for the remainder of her marriage.
Germanic fibulae, early 5th century The Dunstable Swan Jewel, a livery badge in gold and ronde bosse enamel, about 1400. Gold belt end and buckle, c. 600, Avar version of Byzantine style. The Middle Ages was a period that spanned approximately 1000 years and is normally restricted to Europe and the Byzantine Empire.
The introduction of the metal vapor lamp, including various metals within the discharge tube, was a later advance. The heat of the gas discharge vaporizes some of the metal and the discharge is then produced almost exclusively by the metal vapor. The usual metals are sodium and mercury owing to their visible spectrum emission.