We offer our customers a wide range of laboratory equipment including magnetic stirrer with hot plate. It has compact stirring device, which utilizes a rotating magnetic field (created by permanent magnet) that induces variable speed stirring action. The stirring operation is accomplished by means of small Teflon rotor, which is placed in liquid to be stirred.
A polariscope uses polarized light for gem identification. It consists of two polarized filters, one on the top and one on the bottom of the instrument as seen in the picture to the right. Both the polarizer and the analyzer have their own vibrational planes. When the vibrational plane of the polarizer is at right angles to the vibrational direction of the analyzer, the field between them remains dark. This position is known as the "crossed position". In this position, gems can be tested to determine if they are:
The polarizing filters of this instrument are made of polarizing plastic sheets (polyvinyl alcohol containing dichroic molecules stretched-polymers). Older models were created with microscopically oriented crystals of iodoquinine sulfate (herapathite) or tourmaline plates.
Operation of the polariscope and possible observations
With the polarizer and analyzer in crossed position, turn on the light source and place the gemstone on the rotating platform just above the polarizer (this platform might not always be present, in which case you use your tweezers).
Observing the gemstone through the analyzer while slowly turning the stone will give you 4 possibilities.
1. The stone appears dark throughout a 360° rotation.
2. Throughout a 360° rotation the stone blinks 4 times, light and dark.
3. The stone will appear light all the time.
4. The stone will show anomalous double refraction (ADR).
Other Information :
Pay Mode Terms: L/C (Letter of Credit), Other
Minimum Order Quantity: 10 Pieces
Port of Dispatch: New Delhi
Production Capacity: 200p.m
Delivery Time: 15 days