Waterbath Water
Waterbath Water
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Columbian Home 0707-1 Granite Ware 21-1/2-Quart Steel/Porcelain Water-Bath Canner with Rack
List Price:  |
DescriptionColumbian Home Products 21 QT. Cold Pack Canner With Rack Capacity To Hold Seven Quart Jars Note: Cannot be Used on sealed glass top stoves |
Abbe Refractometers
Refractometers are measuring instruments which put the phenomenon of light refraction (bending) to practical use. They are based on the principle that as the density of a substance increases (such as when sugar is dissolved in water), its refractive index rises proportionately. Refractometers were devised by Dr. Ernst Abbe, a German/Austrian scientist in the early 20th century.
The prism in a refractometer has a greater refractive index than the sample solution. Measurements are read at the point where the prism and solution meet. With a low concentration solution, the refractive index of the prism is much greater than that of the sample, causing a large refraction angle and a low reading. The reverse (lower refraction angle and higher reading) would happen with a highly concentrated solution.
Abbe Refractometers are a type of refractometer used for measuring the refractive index of solid samples, such as glass, plastics and polymer films. There are two detection systems for refractive index: transparent systems and reflection systems. Hand-held refractometers and Abbe refractometers use transparent detection systems, and digital refractometers use reflection detection systems. Abbe refractometer readouts can be either digital or analogue.
Abbe refractometers are used most often to measure solid samples – something that standard digital refractometers cannot do. Circulating water baths can be added to control instrument and fluid temperature in Abbe refractometers. Newer versions of Abbe refractometers have recently been upgraded to include Solid State Peltier elements to both heat and cool the refractometer so that you no longer need to use a waterbath. Another modern feature is the ability to link the Abbe refractometer to a computer to control the instrument and to record readings.
Some Abbe refractometers can measure at wavelengths other than the standard 589 nanometers, using filters on up to the near infrared range. They are referred to as Multi-wavelength Abbe refractometers. Multi-wavelength Abbe refractometers can be used to easily determine a sample's Abbe number, which is a measure of the material's dispersion (variation of refractive index with wavelength) in relation to the refractive index. These multi-wavelength Abbe refractometers can be used to test eyeglass lenses, contact lens materials, optical plastics for optical communication, compact disk materials and insulating oil.
Other accessories that are available include digital printers, extra filters and near-IR viewers.
About the Author
National Microscope Exchange has been in business since 1991, selling and servicing abbe refractometers, refractometers and microscopes. The service staff has 30 years of experience with microscopes, and is the authorized United States service facility for Atago brand refractometers, abbe refractometers .
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Columbian Home 0707-1 Granite Ware 21-1/2-Quart Steel/Porcelain Water-Bath Canner with Rack
List Price: |
DescriptionColumbian Home Products 21 QT. Cold Pack Canner With Rack Capacity To Hold Seven Quart Jars Note: Cannot be used on sealed glass top stoves |
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Ball Jar Collection Elite Stainless-Steel 21-Quart Waterbath Canner with Rack and Glass Lid
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DescriptionBeautiful Collection Elite series Stainless Steel waterbath. Canner offers superior performance, enduring quality and year round versatility. 18/10 stainless steel for superior strength and durability to last through generations of canning... |
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DescriptionWater Bath Canner for processing jellies, fruits and other high acid foods. This boiling water bath canner is enamel on heavy gauge steel and is made in the USA. - The manufacturer does not recommend this boiling water-bath canner for glass or ceramic top stoves as it does not have a flat bottom... |
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Water Bath Canner 21qt
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DescriptionWater Bath Canner for processing jellies, fruits and other high acid foods. Includes wire rack to hold 7 quart jars. Kettle has 21.5-quart liquid capacity (can also be used as a blanching or stew pot)... |
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A plan for extending the use of artificial water-baths, pumps, vaporous, and dry-baths, fumigations, and frictions ; by the mode and means invented and directed by Dr. Bartholomew de Dominiceti.
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DescriptionThe 18th century was a wealth of knowledge, exploration and rapidly growing technology and expanding record-keeping made possible by advances in the printing press. In its determination to preserve the century of revolution, Gale initiated a revolution of its own: digitization of epic proportions to preserve these invaluable works in the largest archive of its kind... |
