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Archytas is sometimes called the founder of mechanics and was a contemporary of Plato. One of the first applications of the screw principle was in presses for the extraction of oils from olives and juice from grapes. The oil presses in Pomeii were worked by the screw principle. Archimedes BC – BC developed the screw principle and used it to construct devices to raise water. The water screw may have originated in Egypt before the time of Archimedes. It was constructed from wood and was used for land irrigation and to remove bilge-water from ships. The Romans applied the Archimedean screw to mine drainage.

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A screw is any shaft with a corkscrew-shaped groove formed on its surface. Screws are used to fasten two objects together. A screwdriver is a tool for driving turning screws; screwdrivers have a tip that fits into the head of a screw. Around the first century CE, screw-shaped tools became common, however, historians do not know who invented the first. Early screws were made from wood and were used in wine presses, olive oil presses, and for pressing clothes.

Quantities on hand should be up to date as posted on the website. The US Wood Screws include the traditional head styles, Oval, Round and Flat. We have a.

The goods were entered as other screws and bolts having shanks or threads with a diameter of less than 6 mm, under subheading They were reclassified as wood screws under subheading This protest was timely filed on August 3, Counsel maintains that subheading Alternatively, subheading Samples were provided. The first type are said to be designed from modified tapping screw standards to permit use in man-made materials such as particle – 2 – board and medium density fiber board.

The remaining screws were designed either to a standard tapping screw specification or a substantially similar standard with minor modifications in the nature of improvements. The entries were liquidated under subheading The Customs Form indicates the fasteners have the majority of design characteristics associated with wood screws and they appear to have been modified so as to suit them for use principally in particle board and fiber board, which are wood products.

Counsel concludes these reports do not establish the identity of the fasteners as wood screws, nor do the fasteners conform to any recognized industry standard for wood screws.

The Evolution of the Screw and Screwdriver

If you are trying to determine the age of a piece of American antique furniture , it will require investigative work. Look closely at the the different elements that make the piece of furniture. Examine the level of work that went into the furniture from the joinery, finishing, knobs, and more.

These wooden screws should not be confused with wood screws. Screws for OED earliest date of use: 16respectively. Found described as.

Wood screws are one of the least understood clues in establishing the date and authenticity of antique furniture. They are especially valuable for dating country and primitive furniture. The stylistic techniques used to date formal furniture such as Chippendale and Hepplewhite simply do not work for American country and primitive furniture; screws can tell a story about the history of a piece. Wooden screws — screws made from wood — date from antiquity.

Metal wood screws — for fastening into wood — appear to have originated in the 15th century. Screws are relative newcomers to the production of furniture and did not become a common woodworking fastener until more efficient tools were developed around the end of the 18th century. As furniture increased in complexity and sophistication, and the use of brass hardware, locks and concealed hinges became more popular, there was a need for a fastener that could hold two surfaces together without having to penetrate the back surface of the second piece.

Early screws differ significantly from their modern equivalents, both in how they look and how they were produced. Handmade screws of the 18th century started out much as the handmade nails of the period did, as square iron nail stock produced in a rolling mill. In the American colonies, these iron rolling mills existed all along the Atlantic coastline, turning out nail stock for the blacksmiths in the growing settlements. Many times, the smith who made the nails occasionally made screws, leaving personal traces of the maker.

Lacking a cold hardened steel die with which to cut the threads, the craftsman had to hand cut them himself using a file. Screws produced by this technique can vary significantly in their shape and the thread pitch.

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The turn of the millennium saw the publication of two timely little books on screws and the tools to tighten or remove them. Both Jenkinson and Rybczynski claimed recognition of the earliest known fixing screw and its adjusting device from a diagram of the late 15th. These descriptions transliterate into English as turnscrew.

In the early ‘s, screws were hammered into their shape by a blacksmith. Screws The wood around an old uncoated nail or screw would be oxidized black.

Dictionary of Traded Goods and Commodities Originally published by University of Wolverhampton, Wolverhampton, A cylinder or rod into the surface of which a spiral ridge or groove has been cut, with every part forming an equal angle with the axis of the cylinder, so that if developed on a plane surface it would be an inclined plane. It is sometimes called a male screw. When a corresponding groove is cut in a hollow cylinder or NUT of the same diameter as a male screw, this forms a companion or female screw [Lloyd ].

The screw is considered one of the six mechanical powers, but it is really only a modification of the inclined plane. For this wood, rather than metal was used in the early part of the period, because it was simpler to work. With the growing use of IRON in the eighteenth century, a great variety of equipment was made, which the government of the day wished to keep out of the hands of potential competitors.

As a result, the export was prohibited of ‘Screws for Stamps, Inventors and innovators sought improvements, including ways of using a screw to raise weights [Patents ]; [Patents ] and to make a PUMP [Patents ]. Although not the first, Henry Maudsley’s screw cutting LATHE of , with slide-rest, lead-screw and change-gears, was the first in practical terms and was widely adopted in the early nineteenth century [Singer et al.

The individual screw on an industrial scale was not the only way in which the principle was used.

US197933A – Improvement in wood-screws – Google Patents

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When you want to refinish old wooden furniture, the best place to look is the family storeroom: Check the attic, basement, garage, or wherever unwanted furniture has collected. You may also discover a real antique or two — pieces handed down through the family for generations. Other good sources are secondhand stores, household auctions, and garage sales. With furniture, as with anything else, one person’s junk is another another’s treasure.

Antique stores are a good place to find furniture to refinish, but expect to pay for these pieces. If you’re interested in antiques, recent or old, research before you buy anything. Real antiques and many reproductions are extremely valuable, but there are also many imitations. If you aren’t sure an antique is really antique, pay for an expert opinion. Never buy an antique, or try to refinish it, until you know what you have.

In this article, we’ll discuss how to assess whether a piece of furniture is an antique and whether it is worth saving through the refinishing process. There are many different styles of furniture, and each type has distinguishing features. For the most part, the furniture you’ll encounter will probably be limited to traditional English and American Colonial styles; you aren’t likely to find a Louis XV chair at a garage sale.

The basic English and American styles run the gamut from ornate to severely functional, from massive to delicate.

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Two views of three screws: The one on the left was handmade in the late 18th century. Note the flat spot on the shaft, the irregular threads, blunt tip and the off-center slot. The screw in the center is machine-made around It has sharp, even threads, a cylindrical shape, blunt end and the slot is again off-center. The screw on the right is a modern gimlet screw, post , with tapered shaft, even threads, pointed tip and centered slot.

Since technology often leaves clues to its development, knowing the history of the manufacturing process of screws can help interpret the clues.

Antique & modern Nails, including wood treenails, hand-wrought nails, cut nails, wire nails, An examination of nails and fasteners and other building hardware is a Dating from in England, as the earliest report of nail production, the.

Allowable withdrawal load or force of a common wood screw into side grain perpendicular to the fibers of seasoned dry wood can be expressed as. The specific gravity of Canadian Spruce is 0. The diameter of no. The withdrawal force per inch of penetration can be estimated as. SG – Specific Gravity of oven dry wood. Add standard and customized parametric components – like flange beams, lumbers, piping, stairs and more – to your Sketchup model with the Engineering ToolBox – SketchUp Extension – enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro.

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Dating furniture screws

Screw , in machine construction, a usually circular cylindrical member with a continuous helical rib, used either as a fastener or as a force and motion modifier. Although the Pythagorean philosopher Archytas of Tarentum 5th century bc is the alleged inventor of the screw, the exact date of its first appearance as a useful mechanical device is obscure. Though invention of the water screw is usually ascribed to Archimedes 3rd century bc , evidence exists of a similar device used for irrigation in Egypt at an earlier date.

Whatever your DIY project, one question is likely to arise: should you use nails or screws to fasten the pieces of wood together?

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. Here we describe antique and modern cut nails focusing on tree nails, wrought nails, and cut nails used in wood frame construction or interior finishing or carpentry work. We include useful dates for the manufacture of different nail types along with supporting research for various countries from Australia and the U.

The history, number and types of nails is both interesting and enormous, even if we confine our discussion to just those used in the construction of buildings. Little Flask was one of the wrought ones; made to clinch tight and last long. An examination of nails and fasteners and other building hardware is a complimentary effort useful in determining the age of a building and its components. A close observation of the type of fasteners used in a building is one of the most popular means of estimating its age.

The three types of nails found in North American construction include hand wrought nails, machine cut nails, modern round “wire” nails. Nelson NPS and other nail chronologists point out, however that a wealth other details can describe the date of production and use of each of those three general nail types.

Clues to Dating Antiques #2


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