Physics Instruments

Specially designed easy to use, moderatly priced, for colleges and research laboratories. Ideal for determining the specific rotation of optically active substance. Our laboratories as well. A corning glass tube is enclosed in a circular aluminum tube with top door for access and exclusion of external light. The circular scale is attached near the analyzer and the range of measurement is 0-3600. A moveable vernier on the scale enables reading of optical rotation to 60 seconds. Worm and gears combine rough and fine adjustment, provided with half wave mica plate, giving three parts field for easy setting, adjustable half shadow angles. This instrument can be used on monochromatic light only. When light passes through a polarized sheet and then through the solution, the emerging light is observed through rotatable polarized lens analyzer which is used as eyepiece. The angle of light is rotated and read directly of the circular scale. Supplied on the adjustment stand with detailed working manual, packed in cardboard box.

1 With bulb in the center, 200 mm in velvet lined case.
2 With cup in the center, 200mm in velvet lined case.

(research model half shade for 200 mm tube) Sensitive rotating half shade device. Circular scale 0-3600 combined with sugar scale - 0 to 300 s to + 1300 s Vernier least count 0.050. One piece aluminum casted rigid body. Arrangement for 35 W sodium lamp light source, input 220/230 V AC. Borosil glass tube 100 mm & 200 mm cup type. Supplied without sodium vapour lamp & transformer.

(research model half shade for 400 mm tube) Sensitive rotating half shade device. Circular scale 0-3600 combined with sugar scale - 0 to 300 s to + 1300 s Vernier least count 0.050. Aluminum casted rigid body. Arrangement for 35 W sodium lamp light source, input 220/230 V AC. Borosil glass tube 100 mm & 200 mm cup type. Opt. Sodium vapour lamp & transformer.

he cone bearings are of selected material and the upper and lower parts of the arms are turned and ground in one operation giving the most accurate alignment. Clamps for telescope and prism table are designed so that no strain cones on the cone bearings from clamping, thus avoiding any disturbance of the axial alignment.
Scale is 9” or 10” from lifetime stainless steel/ brass scale, divided on the latest dividing machines. Accuracy of calibration with in 0.01%. Adjustment is provided to verniers for very fine opposition to the scale. The slit jaws are from stainless steel finely ground and the jaw movement is free of any spring action ensuring perfect parallelism at all openings.
Finest achromatic objective are used.
Fine adjustment to the telescope and collimator tubes are provided laterally as well as vertically.
Clamping devices are provided to lock the telescope and collimator after adjustment.
The instrument is finished in a pleasing and practical finish.

Cat. No.	Description
1)	9” with S.S. / brass scale
2)	10” with S.S. / brass scale

X, Y 50mm movement L. C. 0.001 mm 30 x mag.

A	Quarter Size Plate Camera
B	Packet of Films
C	Febry Perot Etalon
D	Febry Perot Etalon
E	Edser Butler plate
F	Condensing Lens
G	Arc Power Supply
H	Arc Stand
I	Micrometer Eyepiece
J	Monochromator

Material optically Glass R.I. either - 1.717 or 1.78. Three faces of the prism are optically flat to surface finish /10
1304 a) = 1.717
1304b) = 1.78
(While placing order please specify the refractive index of the CDS prism)

a) Collimating Tube : (Material : Brass pipe) O.D : 50mm I.D : 44mm for fitting colimating lens
It is provided with ravk & pinion arrangement and slit.Slit is drum type Drum is graduated in 100 equal division. Slit Ht. 10mm : Maximum opening : 5mm : Pitch of the screw of slit: 0.5mm ; L.C.: 0.005mm The jaws of the slit are optically ground. It is provided with Holfmann Diapharagm.

Click to Enlarge

based Model developed by Hilger & Watts ( London )
It is divided into two p barts.
!) Mechanical (2) Optical
Mechanical part consists of following items
a) Bed : Bed is optically ground, length 250mm
b) Lead Screw : Lead screw is optically ground with its nut, length 200
mm pitch 1mm
c) Optical Mirror Mount : Kinematic mirror mounts are to hold the
mirror which be aligned in to orthohonal
direction by means of screw provided at the
rare of the mount .
Optical parts consists of the following items:
a) Beam Splitter
b) Compensating plate size 45mm x 32mm x8mm
50mm x 35mm x 8mm
Beam splitter and compensating plates covered from the same optically worked glass plate
Surface flatness : /10 (both face)
Parallelism : 5 arc sec.
Mirror : 2 nos.
F 25mm thickness 10mm
Front surface coated : Coated material : AI with Sio2
L.C. of Instrument : 10-4 mm

Attachment to convert fabry perot Interferometer into Michelson Interoferometer.

The instrument is suitable for study of hyperfine structure of spectral lines & of zeeman effect. The semi reflecting mirror of the interferometer are optically flat to better than y/20 for D- lines & of sodium and are aluminised somewhat heavily for fringe. The design of the mirror ensures a clear 1” dia aperature for observation of fringers. The febry perot Interferometer manufactured by us is essentially based on the design, features and the dimensions of the interferometer manufactured y M/s Adam Hidder of London expect for the insignificant change in the shape of the base etc. Supplied with telscope of short focal length to observe the fringer but without sodium Lamp unit.

A fine instrument for measurement of refractive index of gases and liquid .It is available with the following accessories;-
a) Jamin interferometer for working with gases and monochromatic light.
b) Telescope for observation of fringes.
c) Plane parallel optical glass cell with mechanical mount for measurement of refractive index of liquids and replacing the tube for gases.
d) Pair of gas cells with the plane parallel windows with mechanical mount for measurement of refractive index of gases.

For measurement of refractive index of liquids & gases .The interference fringes are magnified in the instrument to over 100 times by means of a cylindrical lens of the eye -piece which produced are sharp ar the normal distance of distinct vision.
It consists of following items:
a) Heavy metal platform ( or you can say small metal table as shown in the fig.)
b) Collimator with circular slit is fixed at one end
c) Telescope with cylindrical lens instead of Ramsden eyepiece is fitted on other side of the table.
d) One metal box which is fitted in the front of the telescope consist of razor Glass plate inclined at an angle of 45 deg. This box also contains compensa tion plates. The whole system is connected to micrometer screw gauge to record the readings.
e) Plane parallel optical glass cells for liquids.
f) Pair of gas cells with plane parallel windows for the measurement of refractive index of gases.
g) Vacuum pump single stage having displacement 32 liters per minute with manometer
Supplied without sodium lamp Unit

The PSAW Co - Ordinate Measuring Microscope characterised by carefully lapped micrometer screws and nuts provided with compensating spring device to eliminate back-lash and to minimise its development after prolonged use.