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Opium lamps differ from conventional lamps for lighting in that they are designed to channel an exact amount of heat upward through their funnel-shaped chimneys. An opium pipe, its pipe-bowl primed with a small dose of opium known as a "pill," was held over the opium lamp causing the opium to vaporize and allowing the smoker to inhale the ...
The configuration of the typical opium pipe consists of a long stem, a ceramic pipe-bowl, and a metal fitting, known as the "saddle", through which the pipe-bowl plugs into the pipe-stem. The pipe-bowl must be detachable from the stem due to the necessity to remove the bowl and scrape its insides clean of opium ash after several pipes have been ...
The conduit methods were known to be of better quality, but cost significantly more than K&T. [2] In 1909, flexible armored cable cost about twice as much as K&T, and conduit cost about three times the price of K&T. [6] Knob and tube wiring persisted since it allowed owners to wire a building for electricity at lower cost.
Islamic Golden Age brass astrolabe Brass lectern with an eagle. Attributed to Aert van Tricht, Limburg (Netherlands), c. 1500.. Brass is an alloy of copper and zinc, in proportions which can be varied to achieve different colours and mechanical, electrical, acoustic and chemical properties, [1] but copper typically has the larger proportion, generally 66% copper and 34% zinc.
Bronze weapon from the Mesara Plain, Crete. Copper came into use in the Aegean area near the end of the predynastic age of Egypt about 3500 BC. The earliest known implement is a flat celt, which was found on a Neolithic house-floor in the central court of the palace of Knossos in Crete, and is regarded as an Egyptian product.
But the Ansonia Brass and Battery Company joined the new firm in their place. [2] American Brass began operation on December 14, 1899. [1] [2] There were about 10,000 brass workers in the United States in 1900, and half of them worked for American Brass. [3] Benedict & Burnham and Holmes, Booth and Haydens became part of American Brass in 1901. [2]
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Derveni krater, bronze, 350 BC, height: 90.5 cm (35 1 ⁄ 2 in.), Inv. B1, Archaeological Museum of Thessaloniki, after cleaning and conservation. Conservation and restoration of metals is the activity devoted to the protection and preservation of historical (religious, artistic, technical and ethnographic) and archaeological objects made partly or entirely of metal.