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Ostwald Viscometer

Ostwald Viscometer

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The Ostwald Viscometer is a glass U-tube connected by a capillary tube with an overall height of 237 mm. It can be used to determine the relative molecular mass of a polymer solution based on its intrinsic viscosity.

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Component/Feature         Specification
Size/Scale Diameter6 inches (150 mm) or 7 inches (175 mm/178 mm)
Vernier Reading1 minute of arc (30 seconds also common)
Main Scale0-360° with divisions of (0.5  circ ) (150 mm or 175 mm circle)
Vernier ScaleDouble ended vernier separated by (180 circ )
Collimator LensAchromatic, 178 mm focus, 32 mm clear aperture
Telescope LensAchromatic, 178 mm focus, 32 mm clear aperture
EyepieceRamsden Type ((10 times ) or (15 times ) with cross-line graticule
SlitUnilaterally adjustable, 6mm long
Fine AdjustmentProvided for both telescope and collimator (laterally and vertically)
Prism TableMarked with lines; leveling screws & interchangeable clamp
Main StructureHeavy cast metal with bright plated fittings (sometimes stainless steel scale)
AccessoriesPrism holder, Grating holder, Watchmaker’s eyeglass, L-key, Hardwood case



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