when were cinder blocks invented?
359090
They were probably invented sometime during the Iron Age. I.e. at a time when there were tools available to cut them etc.\nConstruction materials vary according to availability of materials. So, in London for example, clay was abundant so most houses are made of bricks. New Zealand houses are generally made of timber etc.\nSo cinder blocks would be probably something you would have found in volcanic areas.\nThe modern cinder blocks would have to be invented after the development of coal fired power stations.
107861
Actually, it must have been considered quite an important thing becasue many versions of ironing boards have been patented by many people.  Many people believe that Sarah Boone, a former slave, invented the ironing board in 1892.  However, there is evidence that versions of the ironing board were patented long before that.  \n\nCheck out the websites I've listed in the sources.  Interesting!  You never know what you're going to learn by using YahooAnswers!
221240
Philip of Thesalonica, the Greek poet, in about 20 B.C., mentions the use of writing tools fashioned of lead in disc shaped pieces. The small lead disc used by the Romans to rule guidelines on papyrus may have been responsible for the error that led to identifying our family core as lead.
440705
http://inventors.about.com/library/weekly/aa080499.htm click d link to find what u r looking for.
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(3-3/4" x 2-1/2 x 8)\nstandard (common) red brick = 5 pounds \n(density = 1922kg/m³ or 3,239.64 lb/cubic yard)\n\n(8 by 8 by 16) \nconcrete block = approx 26 lbs\n\n(density of SOLID concrete = \napprox 2200kg/m³ or 3,708.2 lb/cubic yard)
130295
:) henry ford invent it in the 1900s
8389
Inventions that aid and protect the ability to breath where gas, smoke or other poisonous fumes exist, occurred before 1915 and the first use of modern chemical weapons. Modern chemical warfare began in Ypres, France; when German soldiers first used chlorine gas on April 22, 1915, to attack the French. Long before that date, miners, firemen, and underwater divers all had a need for helmets that could provide breathable air, and the early prototypes for gas masks were developed to meet those needs.  \n\nIn 1823, brothers, John and Charles Deane patented a smoke protecting apparatus for firemen that was later modified for underwater divers. Augustus Siebe marketed an early diving suit in 1819. Siebe's suit included a helmet to which air was pumped via a tube to the helmet and spent air escaped from another tube. The inventor founded Siebe, Gorman and Co., a company that developed and manufactured respirators for a variety of purposes that was later instrumental in developing defense respirators. \n\nIn 1849, Lewis P. Haslett patented an "Inhaler or Lung Protector," the first U.S. patent (#6529) issued for an air purifying respirator. Haslett's device filtered dust from the air. In 1854, Scottish chemist John Stenhouse invented a simple mask that used charcoal to filter noxious gases. \n\nIn 1860, Frenchmen, Benoit Rouquayrol and Auguste Denayrouse invented the Résevoir-Régulateur, intended for use in rescuing miners in flooded mines, the Résevoir-Régulateur could be used underwater. The device was made up of a nose clip, and a mouthpiece attached to an air tank that the rescue worker carried on his back.  \n\nIn 1871, British physicist John Tyndall invented a fireman's respirator that filtered air against smoke and gas. In 1874, British inventor, Samuel Barton patented a device that "permitted respiration in places where the atmosphere is charged with noxious gases, or vapors, smoke, or other impurities" according to U.S. patent #148868. \n\nAmerican, Garrett Morgan patented the Morgan safety hood and smoke protector in 1914. Two years later, Garrett Morgan made national news when his gas mask was used to rescue 32 men trapped during an explosion in an underground tunnel 250 feet beneath Lake Erie. The publicity sold the safety hood to firehouses across the United States. Some historians site the Morgan design as the basis for early U.S. army gas masks used during WW1, others do not. \n\nEarly air filters include simple devices such as a soaked handkerchief held over the nose and mouth. Those devices evolved into various hoods worn over the head and soaked with protective chemicals, goggles for the eyes and later filters drums were added.  \n\nThe British built a carbon monoxide respirator for use during WW1 in February 1915, before the first use of chemical gas weapons. It was discovered that unexploded enemy shells gave off high enough levels of carbon monoxide to kill soldiers in the trenches, foxholes, and other contained environments. Similar, to the dangers of the exhaust from a car with its engine turned on in an enclosed garage.  \n\nCanadian, Cluny Macpherson designed a fabric 'smoke helmet' with a single exhaling tube, impregnated with chemical sorbents to defeat the airborne chlorine used in the gas attacks. Macpherson's designs were used and modified by allied forces and are considered the first to be used to protect against chemical weapons.  \n\nIn 1916, the Germans added larger air filter drums to their respirators containing gas neutralize chemicals. The allies soon added filter drums to their respirators as well. One of the most notable gas masks used during WW1 was the British Small Box Respirator or SBR designed in 1916. The SBR was probably the most reliable and heavily used gas masks used during WW1.
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From the early 1500s brick began to be used by the wealthy to build houses. Ralph Sadlier, a court official and Henry VIII's ambassador to Scotland built Sutton House in Homerton in 1535. Sutton House is still standing today and is now a museum. It is a very impressive house now but it would have seemed magnificent to ordinary people in Tudor times with its brick walls, huge hall and wood panelled rooms. \nIt was during this time that glass emerged as a material for domestic buildings. It was still very expensive though and difficult to produce in large pieces so windows were made from many small panes of glass held together in a grid or lattice pattern. They were usually casement windows so air could be let in and rubbish etc could be thrown out. \n\nHoxton, just outside the north east city wall, was still countryside at this time and as it was away from the dirt, noise and disease but close enough to the city for business and leisure pursuits it was the perfect place for the gentry to live. Over twenty grand houses were built on Hoxton Street during this time, and surrounded by fields and trees it must have been very pleasant. \n\nBalmes House, built around 1540 to the west of Kingsland road, was another grand home. By the time of the Stuart period it belonged to Sir Whitmore and is mentioned in Pepys' diary in 12th May 1667, "... to Sir G Whitmore's house, where we light and walked over the fields to Kingsland and back again, a walk I think I have not taken these twenty years but puts me in mind of my boy's time, when I boarded at Kingsland and used to shoot with my bow and arrow in those fields." \n\nOf course most people did not live in great houses like these. In the country people still lived in wattle and daub houses with thatch roofs like they had for hundreds of years. Although sometimes now they had an upstairs and were a bit bigger they still could not afford bricks and tiles and glass in the windows. Inside most peasants' homes were as spartan as on the outside. Aside from cooking implements and matting to sleep on there would have been very little else, if anything.
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Briton B. M. Wright invented a new. pneumatic nebulizer \n\n1958
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Batteries consist of electrochemical devices such as one or more galvanic cells, fuel cells or flow cells. The earliest known artifacts that may have been batteries are the Baghdad Batteries, from some time between 250 BCE and 640 CE. The modern development of batteries started with the Voltaic pile developed by the Italian physicist Alessandro Volta in 1800. The worldwide battery industry generates US$48 billion in sales annually
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Toilets appeared as early as the year 2500 BCE. The people of Harappa in India had water borne toilets in each house that were linked with drains covered with burnt clay bricks. There were also toilets in ancient Egypt, Persia and China. In Roman civilization, toilets were sometimes part of public bath houses where men and women were together in mixed company.\n\nAnd NO! Thomas Crapper did NOT invent it. Look in Wikipedia for more detail.\n\n\nQuote: "Thomas Crapper (baptized September 28, 1836; d. January 27, 1910) was a plumber who founded Thomas Crapper & Co. Ltd. in London.\n\nDespite urban legend, Crapper did not invent the flush toilet (the myth being helped by the surname). However, Crapper put in much effort to popularise it and did come up with some related inventions."\n\nEnd Quote.\n\n\nExtra detail: "1880s: Thomas Crapper's plumbing company built flush toilets of Giblin's design. After the company received a royal warrant, Crapper's name became synonymous with flush toilets. Although he was not the original inventor, Crapper popularised the siphon system for emptying the tank, replacing the earlier floating valve system which was prone to leaks. Some of Crapper's designs were made by Thomas Twyford. "\n\n\n\nAnd, why am I writing so much? Because I'm finaly lvl 2 ))))\nHope My answer will be enough for yall. Heh.\n\n\nhttp://en.wikipedia.org/wiki/Thomas_Crapper\n\nhttp://en.wikipedia.org/wiki/Flush_toilet
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You can go here :\n\nhttp://inventors.about.com/library/inventors/blgum.htm
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The Great Idea Finder credits Johnson and Johnson Co. with inventing duct tape in 1942. (see link below)\n\nRichard Drew invented adhesive tape (masking tape). \n\n"Adhesive tape (specifically masking tape) was invented in the 1920's by Richard Drew of Minnesota Mining and Manufacturing, Co. (3M). Duct tape (the WWII military version) was first created and manufactured in 1942 (approximate date) by the Johnson and Johnson Permacel Division. Its closest predecessor was medical tape."
1091992
i went to see the traveling veterans wall in new philadelphia, ohio today before its moves to its next location. anyway i know alot more than most people at age 27 do about our country. and from the lips of people speaking at the ceremony today and to words on the computer, it IS NOT definate on who designed it but most would agree that Francis Hopkinson designed it and Betsy Ross was the first to make one
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1989 due to the fall of communism between East and West Germany.  I have actually held some of the wall and it is so awesome to think it was once a great divider
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I don't think they used wood for that purpose in those days.Clay and pottery jars were common and the only thing that was needed to keep the liquid, was a stopper,usually made of bees wax.
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Near East, about 100 BC, it is believed from archaeological finds - ceramic vessels with metal rods, thought to have contained saline solutions.\n\nModern use of batteries was introduced by Galvani around 1790.\n\nThe principle is the same as for modern batteries: connected galvanic half-cells. The use seems to have been for electrolytic coating.