Emerald And Pearl Necklace Set Jewellery Collection 27

Emerald And Pearl Necklace Set Jewellery.

By Fashion Jewellery.emerald-And pearl influenced-style-indian-and uk pearl-belt-necklace-converter-chain-jewelry-versatile-spring-2013celebrity-designer-trends jewellery.        By Aamir mannan.

 Refractive Index And Its Measurement. How To  Use The Refractometer. Though refractometers are essentially very simple to use, the beginner will do well to read carefully the instructions and warnings thats follow most of which will apply to any present day types of jewellers refractometers. remember above all that the sureface of the prism on which the stone is placed consists of a very soft form of glass and is therefore easily scractched by a corner or edge of the stone that are being 


tested good reading can only be expected if the surface is preserved in an unblemished state. the standard type of refractometer will be dealt with first. the instrument should be placed on a steady bench or table, and should be mounted on some stand or block to allow for easy reading a bench lamp or adjustable reading lamp fitted with a 60 watt pearl blub provides adequate illuminations and should be so arranged that the light can pass direct from the lamp to the window
of the refractometer. the lamp itself being positioned a little lower than the window. in every case if the illuminations is correct the observer should see on looking through the eyepiece a brightly and evenly illuminated scale. if this is not sharply in foucus the eyepiece should be adjusted by rotation. we have now reached a point where all is in readiness to take a refractive index reading. a suppliers of highly refractive liquid in a dropping bottle is provided with each instrument . place a small drop of this liquid on the glass table of the refractometer.

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