Quartz Crystal Skull
Quartz Crystal Skull
History Of Ultrasound - Inventor & Advancements
The history of ultrasound began with SONAR (Sound Navigation and Ranging) for submarines and has had many uses with varying degrees of success since then.
Ultrasound history, medically speaking, has been primarily a diagnostic technology although it has been tested and used for therapy as well. Doctors and sonographers have been capturing images from within the human body since the 1940's and in spite of its varied history, ultrasound has become one of the most widely used medical diagnostic tools in modern medicine.
- When was ultrasound testing invented? 1826.
- Who invented ultrasound? Swiss physicist, Jean-Daniel Colladon.
- How was ultrasound discovered? Colladon used an underwater bell to determine the speed of sound in the water.
-
How did ultrasound progress to what is in 2010?
- Many studied sound vibrations (waves), transmission, propagation, and refraction throughout the 1800's.
- English Lord Rayleigh published in 1877 "the Theory of Sound" & first described a sound wave as a mathematical equation, forming the basis of future practical work in acoustics.
- Italian biologist, Lazzaro Spallanzani, in 1794 demonstrated the ability of bats to navigate accurately in the dark via echo reflections from high frequency inaudible sound or 'ultrasound'.
- High frequency sound waves (above the limit of human hearing) were generated by English scientist Francis Galton in 1876, through the Galton whistle, which was his invention.
- Austrian physicist Christian Doppler and Buys Ballot in 1845 proved the Doppler Effect on sound waves: A sound's pitch would change if its source or recipient was in motion. This was a very significant change to the future of ultrasound.
- It was discovered in Paris, France in 1880 by Pierre Curie and his brother Jacques Curie, that electric potential would be produced when mechanical pressure was exerted on a quartz crystal.
- The opposite of which was mathematically deduced from thermodynamic principles by physicist Gabriel Lippman in 1881. The generation and reception of 'ultrasound' was now possible.
- Underwater sonar detection systems were developed for the purpose of underwater navigation by submarines in World war I.
- The first working sonar system was designed and built in the United States by Canadian Reginald Fessenden in 1914. This system was able to detect an iceberg underwater from 2 miles away. Powerful electronic amplifications were necessary for developments in ultrasonic instruments:
- French physicist Paul Langévin and Russian scientist Constantin Chilowsky developed an ultrasonic echo-sounding device called the 'hydrophone', the basis of the development of naval pulse-echo sonar.
- Discoveries and developments parallel to echo sound, such as electro-magnetic RADAR;
- ENIAC, the first digital computer;
- and the point-contact transistor.
- In the Medical field, the heating and disruptive effects of ultrasound were applied to therapy, also as a neuro-surgical tool, before being used in the 1940's for diagnosis.
- Karl Theo Dussik, a neurologist/psychiatrist at the University of Vienna, Austria, and his brother Friederich, a physicist, first employed ultrasound in medical diagnosis by attempting to locate brain tumors by sending an ultrasound beam through the skull which produced an A-mode image. The amplitudes seen on the image showed both sides of the skull and the midline of the brain. If a midline shift was seen, a conclusion was made that there was either a tumor or a bleed. The "image" was recorded photographically on heat-sensitive paper.
About the Author
Steve Chard, CEO YWPD, is an Orlando web designer, Daytona Beach to Clearwater corridor. One of YWPD's offerings is professional article writing, copy writing, and Orlando SEO.
On a website management contract with DrSmart.com as their article marketing strategist for search engine optimizationin Clermont, Steve Chard researches and writes articles to produce the best article marketing in Clermont, FL.
 |
 Crystal Skull Clear Quartz 5Lbs Beautiful Size  US $1,350.00
|
 716LB Pink Rose Quartz Crystal Double Skull Point US $899.99
|
 Huge 97 Natural Pink Rock Quartz Crystal Skull Head Carving 3R18Healing US $850.00
|
 149LB LARGE GIANT NATURAL CLEAR RAINBOW QUARTZ CRYSTAL SKULLS CARVED China US $418.99
|
 FINE LARGE Transparent Clear Quartz Rock Crystal Skull AA Hand Carved US $399.00
|
 3130g AAA NATURAL CARVED CLEAR RARE HAIRS Inclusion QUARTZ CRYSTAL SKULL US $388.00
|
 63lb AAA NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $368.00
|
 80 CRAZY CLEAR NATURAL QUARTZ CRYSTAL SKULLS CARVED US $298.00
|
 AAA 3130g NATURAL CARVED CLEAR QUARTZ RARE HAIRS Inclusion CRYSTAL SKULL US $288.00
|
 48lb AAA NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $288.00
|
 3130g AAA NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $278.00
|
 Amazing Water Clear Smokey Quartz Carved Crystal Skull HeadCrystal Healing US $260.00
|
 2900g AAA NATURAL CARVED CLEAR RARE HAIRS Inclusion QUARTZ CRYSTAL SKULL US $258.00
|
 2220g AAA NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $228.00
|
 2360g AAA NATURAL CARVED CLEAR RARE HAIRS Inclusion QUARTZ CRYSTAL SKULL US $222.00
|
 51lb AAA NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $218.00
|
 Big Super Water Clear Quartz Crystal Healing Skull Premium Quality Hand Carved US $200.00
|
 AAA 565lb NATURAL CARVED CLEAR QUARTZ CRYSTAL SKULL US $200.00
|
 53 CRAZY NATURAL ROSE QUARTZ CRYSTAL SKULLS HAND CARVED wholesales US $199.99
|
 Smoky Quartz Crystal Skull Hand Carving Brazil US $195.00
|
 18 CRAZY CLEAR NATURAL QUARTZ CRYSTAL SKULLS CARVED Wholesales US $194.99
|
 2880g634lb Carved NATURAL smokey quartz crystal skull healing US $177.77
|
 CRAZY CLEAR NATURAL QUARTZ CRYSTAL GEODE SKULL CARVED US $177.77
|
 40 NATURAL PURPLE AMETHYST QUARTZ CRYSTAL SKULLS CARVED Whholesales Price US $177.00
|
 40 NATURAL CLEAR QUARTZ CRYSTAL SKULLS CARVED HEALING WHOLESALES to122 US $168.00
|
 d0124 Clear Quartz Crystal Carving Art Skull Healing US $158.98
|
A Brief History Of Cubic Zirconia
As a general rule of thumb, gemstones can be classified into three categories; natural, synthetic and simulant. Obviously, natural gems are mined and cut from minerals. For example, diamonds come from the mineral carbon. Organic materials such as pearls, coral and ivory are also considered natural gemstones.
Synthetic gemstones are manmade but for the most part are created to give the gem the same appearance and chemical properties of their natural counterparts. Some examples of synthetic stones that are commercially produced are alexandrite, emerald, garnet, quartz, and many more. There are even some synthetic stones produced which do not have a natural partner.
A simulant gem is one that is grown in a laboratory and may look a lot like a natural stone but it will have different chemical and physical properties. Cubic zirconia is one example of a simulant gemstone, which was first grown in a lab in 1976, and is now commonly used as a fabulous diamond substitute in much of today's jewelry designs.
The cubic zirconia more closely resembles a diamond than any other stone ever manufactured by man. It is slightly less hard and reflects slightly less light but is impossible to distinguish from a diamond to the naked eye. Cubic zirconia, like a diamond, is available in both high and low grades and its price will vary accordingly.
Cubic zirconia is manufactured using what is called a skull melting system. This system is used due to the fact that cubic zirconia has a very high melting point. The skull refers to the copper cup in which the powders to grow the crystals are melted. The hollow walls of the cup are filled with water which keeps the powders next to the wall from melting while the powders in the center are heated and melted to the proper temperature. As the cup of liquid cools, crystals form and cubic zirconia is created.
Once the crystals have been grown and harvested, it is the responsibility of the gem cutter to cut the stones to the appropriate size and shape. The specifications for cutting the stones are very exact and cutting are a very precise undertaking. It is always the goal of the gem cutter to use as much as possible of the crystal to create the best quality gems. Just as with cutting diamonds, the gem cutter will determine the best cut to maximize the refraction of light within the stone, thus giving the stone its clarity and thereby, its value.
As its production methods improve, cubic zirconia continues to remain a popular choice for jewelry designers and consumers alike. No longer used solely in rings as it once was, cubic zirconia is now becoming an alternative choice among jewelry wholesalers everywhere in the design of earrings, tennis bracelets and other quality pieces. Its reputation as a diamond substitute is being over shadowed by its popularity as a mainstream diamond alternative.
If you liked this article, tell all your friends about it. They'll thank you for it. If you have a blog or website, you can link to it or even post it to your own site (don't forget to mention paradisojewelry.com as the original source).
About the Author
Alison Takvorian writes articles for Paradiso Jewelry, a leading
jewelry wholesaler
in Los Angeles. Paradiso Jewelry offers unique and elegant jewelry for distributors at amazing wholesale prices. Find out how you can become a distributor.