Toilet



Background

A system for dealing with excrement is necessary in every human community, and the need becomes more pressing the more densely populated the area. Though simple pit latrines are still common in many rural areas today, more complex lavatory designs date back thousands of years. The Old Testament contains several references to toilets, from laws about how to cover waste out of doors to mention of King Eglon of Moab's indoor privy chamber. Some kind of lavatory flushed with water is believed to have been used by residents of the Indus Valley by around 2000 B.C. Even earlier, in about 2750 B.C. , the ancient Indian city of Mohendro Daro was equipped with toilets connected to a drain. Dating back to approximately 4000 B.C. , the neolithic stone huts of the Scara Brae settlement in the Orkney Islands seem to have had indoor lavatory provisions. Apparently used as toilets, stone chairs have also been unearthed from the site of the Sumerian city of Ashnunnack, dating to around 4000 B.C. The palace of King Minos of Crete, from about 2000 B.C. , had elaborate indoor plumbing, including marble toilets that were flushed with water dumped from a vase in an adjoining room.

The remains of Roman lavatories are still extant in many places. Some private Roman houses had their own toilets, which were in most cases a seat located over a drain or a cesspit. Roman public lavatories were more impressive. They were often built next to or as part of public baths. Rows of stone or marble seats in pairs, divided by armrests, stood over a trench. Excess water from the baths flowed into the trench, and washed the waste into a main sewer. A smaller trench filled with fresh water flowed past the base of the stone toilets. This water was used for rinsing. Roman forts, which housed hundreds of soldiers, also boasted impressive toilet facilities. The builders of Housesteads, a Roman fort in northern England dating to 122 A.D. , diverted a river to flow underneath the latrine and carry waste out of the fort. The latrine itself was a large room with benches built around three walls. The benches had about 20 holes with no dividers for privacy. Roman cities also took care of the needs of travelers by erecting huge vases along the roadways for people to urinate into, thus keeping waste off the public streets.

During the Middle Ages, lavatories drained with running water were common in British abbeys, which housed large groups of monks. Similar to the Roman forts, abbey latrines were usually meant for many people to use at once, and drained over a river or stone drain. Stone castles were often designed with vertical shafts for the emptying of waste. The waste flowed into a trench leading in most cases to the moat. Indoor toilets consisted of wooden closets or cupboards, which concealed a seat over a chamber pot. Servants emptied the pot into the moat.

In Medieval European cities, common practice was to empty indoor chamber pots directly into the streets, a foul practice that bred disease. Something akin to the modern flushing toilet first came into use in England at the end of the sixteenth century. A water-operated "water closet" was invented in 1596 by Sir John Harrington. Queen Elizabeth I had Harrington's device installed in her palace, setting the vogue among the nobility. However, flushing toilets did not catch on with the bulk of the population until much later. The first British patent for a water closet was awarded to Alexander Cumming in 1775. His device used a pan with a sliding door. The pan contained a few inches of water. When finished, the user would pull a lever that opened the pan, letting the contents slide out into a drain, and at the same time opening a valve that let fresh water into the pan. The Bramah water closet, patented by Joseph Bramah in 1778, used a similar but more complex flushing device that kept the water running for about 15 seconds. By about 1815, water closets of this type had become common in London households. A modern sewer system was completed in London in 1853, and a large-scale toilet manufacturing industry dates to around this time.

Raw Materials

Toilet bowls and tanks are made from a special clay called vitreous china. Vitreous china is a mix of several kinds of clay, called ball clay and china clay, silica, and a fluxing agent. Clays are hardened by first drying in air, then being fired (baked) in a very hot oven called a kiln. Usually a shiny, waterproof coating called a glaze is applied only after a first firing, and the clay is fired a second time. Vitreous china is an exception, in that clay and glaze can be fired together. The whole clay body vitrifies, or turns glassy, so the toilet is actually waterproof and stainproof through its entire thickness.

Toilet seats are generally made from one of two materials. Plastic toilet seats are made from a type of thermoplastic called polystyrene. The less expensive and more common type of toilet seat is made from a blend of wood and plastic. The wood is hardwood, usually maple or birch, which has been ground up into the consistency of flour. This wood flour is blended with a powdered plastic resin called melamine. Zinc stearate is a third ingredient in wooden toilet seats. This prevents the wood-resin mix from sticking to the mold in the manufacturing process. The metal tank fixtures are made of stainless steel or copper, and the joints that hold the seat to the bowl are usually a rubber-like plastic.

A chamber pot.
A chamber pot.

Some Victorians couldn't abide the thought of indoor toilets because they reviled at the notion of odor and unclean gases associated with them. Today, it is difficult to imagine life without indoor plumbing. How awful to have to scurry to the outhouse in cold weather or to stumble to the privy late at night when duty called.

One did not always have to walk to the privy on these occasions, however. Instead, one could use a ceramic chamber pot. It functioned like an indoor toilet that did not flush—one perched upon it for defecation or used it as a urinal and then the "slop jar" was emptied into the outhouse. Some chamber pots were decorated with lacy covers along the edge of the bowl called silencers and presumably muffled the noise of clanking of the top upon the bowl at night so that others weren't awakened by its use.

The chamber pot in the photo is part of a large set of ceramics used for personal hygiene in the days before indoor plumbing. Many bedrooms had a pitcher for fresh water, a basin to hold the water for cleansing, a soap dish and a chamber pot. These ceramics were always fashionably decorated, so that the bedroom could be attractively appointed even for these disagreeable tasks.

The Manufacturing
Process

Plastic seat

Wooden seat

Bowl and tank

Quality Control

As with any industrial process, quality checks are taken at several points in the manufacturing of toilets. The clay is sieved and purified before it is pumped into the factory's tanks. Workers doing the manual finishing of the castings check the pieces for cracks or deformities. After firing, each toilet is tested individually. Random sample checks are not a good enough gauge of quality: each piece must be inspected for cracks. There are several ways to do this. One test is to bounce a hard rubber ball against the piece. It should emit a clear, bell-like ringing sound. A cracked piece will give off a dull sound, indicating a crack that might not have been visually obvious.

Byproducts/Waste

The pottery is able to recycle much of its clay. As long as it has not been fired, all the clay is reusable. Even the air-dried greenware can be scrapped, softened and reprocessed into the watery slip of the first step of the process.

Where to Learn More

Books

Barlow, Ronald S. The Vanishing American Outhouse. El Cajon, California: Windmill Publishing Company, 1989.

Hart-Davis, Adam. Thunder, Flush and Thomas Crapper. North Pomfret, Vermont: Trafalgar Square Publishing, 1997.

Reyburn, Wallace. Flushed with Pride: The Story of Thomas Crapper. Englewood Cliffs, New Jersey: Prentice-Hall, 1971.

Angela Woodward



Also read article about Toilet from Wikipedia

User Contributions:

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Jun 10, 2011 @ 3:15 pm
Hey gang,am wondering whether there is any paint mixed with the slurry slip to make the color of the toilet evenly distributed not only on the surface?

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