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examination of spectral composition of white light, radiant bodies
Comprises a metal draw-out tube of 20mm diameter, with an adjustable
slit at one end. The light passing through this slit falls on the
prism elements and break up into a spectrum. This can be viewed
through an eye piece at the other end of the tube. Fully drawn-out
length is 130mm. Supplied in a velvet lined case.
For introducing students to principal
type of spectra, determination of wavelength, frequency of emitted
light and for quantitative spectrometric measurement of angle of
prism, refractive index of the prism material etc.
Comprised of a cast base with an integral fixed pillar for the
collimator support and a swinging telescopic arm. Both the collimator
and the telescope are fitted with an axis adjustment system.
The moving telescope arm with a
spring loaded vernier moves smoothly over a machine engraved degree
plate of diameter 180mm and is graduated 0-360ß x 1ß.
The vernier reads to
0.1ß or 6 seconds and allows students to estimate angular positions
to 0.05ß. Fine adjustment is provided.
The collimator and the telescope tubes are fitted with optically
coated achromatic objectives of diameter 25mm and have a concealed
helical action focusing device. The 10X Ramsden eyepiece has a cross
The prism table, diameter 75mm is leveled by three knurled knobs. It
is fitted with a diffraction grating holder of aperture 25 x 25mm and
a clamp for holding a prism up to 38mm high. Lines are marked on the
table to help place the prism accurately. Various parts are either
plated or enamel finished.
Provided with a magnifying eye glass and a tommy bar for axis
adjustment but without prism or diffraction grating. Supplied in a
Product Code: 3380-00
Similar to 3380-00 but with enhanced
features for obtaining better quantitative results. Consists of a
heavy cast base and a pillar for collimator support. The telescope arm
moves along a fixed circular plate 150mm diameter graduated in
degrees. This plate has a double ended vernier for better and accurate
measurements, with a least count of 30. Fine adjustment is
accomplished by using a knob while the coarse adjustment can be done
by hand. Both the collimator and the telescope are mounted with an
axis adjustment system.
The telescope has a 10X Ramsden
eyepiece and is fitted with a cross hair reticle. Both the telescope
and the collimator are fitted with coated achromatic objectives of
178mm focal length and 32mm diameter, providing light for a brighter
and sharper image.
The focusing is done
by a concealed rack and pinion. The collimator slit 6mm long, is
specially designed for retention of initial accuracy during the life
of the instrument.
The prism table 75mm diameter is held with the help of a clamping
screw enabling the table to be rotated in any direction. It has lines
and concentric rings marked to assist positioning of prism in relation
to leveling screws. It is fitted with a diffraction grating holder of
aperture 25mm x 25mm and a clamp for holding prisms up to 38mm high.
Provided with a magnifying eye glass to read the vernier, tommy bar
for axis adjustment and flannel cloth. Supplied in a wooden box.
Product Code: 3381-00
Distributors of scientific and educational products
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product in the online store of your choice, please use the search option of the
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Zealand, Germany, France, Netherlands, and many other countries.
List of metals for science experiments