A (Very) Brief History Of Ink Ink was created so man could leave a record of his thoughts and ideas. Ink has come a long way from the sooty drawings found on cave walls. Indians were known to use ink in 4th century BC made from burnt bones, pitch, and tar. There is also evidence of ink being used by ancient Chinese civilizations dating back to 256 BC. These early Chinese inks were made from fish glue. http://www.kagemink.com/printing-ink/

Spring loaded poppet valves are commonly used as a pressure reducing element. Poppet valves have elastomeric sealing in regular applications and a thermoplastic sealing in high pressure applications. This seals the valve seating against any gas or fluid leakage. The poppet valve is controlled by the spring force to open the valve and let the medium flow from inlet to outlet. As there is a rise in output pressure, the poppet valve closes due to the force generated by the sensing element, which overcomes the spring force. http://www.novors.com/gas-regulator/low-pressure-regulator/

An engagement ring is a ring that shows that the wearer is engaged to be married. It is a popular engagement gift in Western Cultures as can be found in the United States. Today, 80% of betrothed women are given engagement rings to mark the occasion. But where did that tradition come from? It actually has its roots in the distant past. Historically, the use of wedding rings began with the Egyptians. The circular bands represented eternity. Wearing a round band on one's finger symbolized their commitment to being together forever. http://www.sevenajewelry.com/ring/engagement-ring/

A Herbal Extract is a substance made by extracting a part of a herbal raw material, often by using a solvent such as methanol or water. The process of Herbal Extraction is usually designed to maximise a certain portion of the original chemical compounds found in the plant, many of which have a therapeutic action. Extracts may be sold as tinctures, absolutes or in powder form. Herbal Extracts are now used as a major part of alternative medicine in both Ayurveda and homeopathy. http://www.xazbbio.com/herbal/

It also doesn’t have any holes or openings. To increase strength, many belt materials contain additives, including fabric, steel, polyester or fiberglass. Many flat belts are actually composed of a core material and a covering. These belts are parts of many different types of conveyors, including troughed, inclined, horizontal, food grade and overhead conveyors, but they are not used in chain, pneumatic or screw conveyors. http://www.xhconveyorbelt.com/chevron-conveyor-belt/

In a diesel engine, air and the fuel are infused into the engine at different stages, as opposed to a gas engine where a mixture of air and gas are introduced. Fuel is injected into the diesel engine using an injector whereas in a gasoline engine, a carburetor is used for this purpose. In a gasoline engine, fuel and air are sent into the engine together, and then compressed. The air and fuel mixture limits fuel compression, and hence the overall efficiency. http://www.xtengineparts.com/diesel-engine/

First, choosing between drip watering and spray irrigation is a basic decision you will have to make. The choice should depend on factors such as the size of your lawn, the plants you wish to grow, and your budget. While spray irrigation systems are more commonly seen, you should consider the advantages of drip irrigation before making a final decision. In general, spray irrigation systems are better for covering larger areas. http://www.yby-irrigation.com/spray-irrigation/

Although anabolic steroids are perhaps the most well-known substances that bodybuilders inject to bulk up muscle, they also sometimes inject other substances, including natural oils — like sesame oil, walnut oil and paraffin — to make their muscles appear to be larger, the report said. Natural oils are less expensive than anabolic steroids, which may make them an attractive option, particularly for amateur bodybuilders, the report said. http://www.yycindustry.com/bodybuilding-oil/

Aluminum is a truly remarkable metal. Due to its signature properties (malleability, rust and corrosion resistance, etc.) countless individuals have taken aluminum and have used it for numerous applications. If you are like many, it can be difficult to understand what exactly the uses of aluminum coil are. Do not worry. Wrisco has prepared a small list of industries and practices that rely on aluminum coil to get the job done. So if you are curious to know what the uses of aluminum coil are, then continue reading below. http://www.chinawanjintong.com/aluminum-coil/