Photographic replica gratings mounted on a plate glass & suitable for visual. Grading size 25 x
25 mm, on glass plate 50 x 38 mm. The grating are of :
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Rectangular, all sides polished, made
from slightly greenish glass free from bubbles
Dimensions (a) 75 x 50 x 12 mm (b) 75 x 50 x 18 mm (c) 100 x 60 x 18 mm (d) 115 x 65 x 18 mm (e) 125
x 65 x 18 mm
Comprising a lamphouse & transformer. The lamp gives a steady light for high intensity.
Special design of transformer ensures that the lamp starts immediately as it is switched on. When mounted on the integral stand, the lamp is enclosed by a
cylindrical lamp house with a circular aperture & the light centre height is adjustable from 200 mm onwards.
Comprising a metal holder with sides grooved to hold the lens or mirror. The holder is finished in matt
black & is free standing for bench use, to hold lens 50 mm in diameter.
To take lenses & mirrors of upto 75 mm diameter. Comprises a wooden upright 100 mm high, with a V
shaped slot to hold convex or concave lenses or mirrors mounted on a rectangular wooden base.
For reflection, refraction, and color mixing experiments. The light box consists of a light
source 12 V, 24 W lamp, producing convergent, divergent or parallel beam.
For demonstrating that white light may be composed from all the spectral colors by rotation of multi-colored
disc. Comprising a multi-colored disc, 180 mm. diameter, mounted on metal stand and driven by belt with the help of driving wheel, fitted with a handle,
Consists of a plano convex lens, 63 mm dia & 2000 mm focal length, on a flat glass plate of
equal diameter. Both enclosed in a metal ring frame with compression adjusting screws equispaced to ensure correct contact between the two elements.
This instrument is a compact instrument with full arrangements for conducting Newton’s Ring
Apparatus. A standard microscope with 30x magnification is provided with a rotatable cross line & the eye piece can be focused on individual
requirements. The microscope tube unit can be raised or lowered & clamped at any desired position. The focusing of microscope is through rack ...
One meter length, single square stable graduated rod, fitted on two sturdy metal feet with leveling
screws. Supplied with four sliders with index marking. Two of the sliders are provided with transverse fine motion knobs. Supplied complete with two lens
holders and two sharp optical pins.
1.5 meter long, for advanced research work; consists of two rods, one stainless steel & one chrome plated steel. The stainless rod is divided in mm. These are supported on heavy cast
iron feet with levelling screws. Four specially designed metal sliders
having a fine index mark enables reading to be taken on scale with ease
& accuracy. The
sliders are machined metal so they slide ...
Circular blacked metal screen, 75 mm diameter with 12.5 mm central aperture. A
screw controlled, spring loaded precision slit is mounted on one side of the disc, the adjustment drive being arranged so that the slit can not be over
tightened. The slit has levelled jaws with brass, dovetail section slides, & provides a maximum slit opening of 4 mm approx. with a useful length of 10
Cylindrical 20 mm internal diameter x 22 mm deep painted matt black is mounted
coaxially upon a polished brass rod 35 x 6 mm diameter.
A circular blacked metal screen 75 mm dia with a 10 mm diameter aperture &
cross wire of 26 swg wire. Mounted on a 6 mm brass rod giving a centre height of 80 mm approx.
In metal frame 100 x 75 mm with a central aperture 63 mm diameter. Mounted
on a 6 mm brass rod giving an optical centre height of 80 mm approx. Overall 130 mm height.
A metal screen 75 mm diameter, with an adjustable iris diaphragm mounted in the
centre, giving a maximum aperture of 6 mm. The disc is mounted on a 6 mm brass rod & the optical centre height is 80 mm approx.
A 240 V 15W white B.C. Pygmy lamp in a conical lamp house 70 mm long x 65 mm
diameter. Mounted on a 6 mm brass rod giving an optical centre height of 80 mm approx. Supplied complete with 1.5 mm of twin flex.
The micrometer slit is as above but has a heavier screw thread, 0.5 mm pitch x
6 mm diameter, carrying a drum which is divided into 50 divisions giving a reading of 0.01 mm. An index is provided with a 5 mm scale divided in 0.5 mm
A circular metal screen 75 mm diameter with 10 mm central aperture covered with
1.5 mm mesh wire gauze. Mounted on a 6 mm brass rod thus giving an optical centre height of 80 mm approx.