Spherical, optically worked glass, with ground edges, highly polished.
Diameter mm.
Focal Length mm.
50
50
50
100
50
150, 200, 250, 300, 500, 1000
Lenses with Dia. 38, 60, 75 mm. also available
CONCAVE, CONVEX MIRROR, GLASS
Optically worked, silvered back with protective coating.
Dia. mm.
Focal Length mm.
50
50
50
75
50
100
50
150
50
200
50
300
75
50
75
75
75
100
75
150
75
200
75
300
NEWTON'S COLOR DISC
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, individually packed.
LIGHT BOX AND OPTICAL SET EISCO
This kit is very useful 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. On one
end, an adjustable cylindrical convex lens (for parallel beam) and
on the other end, a triple aperture system for color mixing
experiments (lateral aperture are provided with adjustable
hinged mirror). All apertures in the box are provided with vertical
channels to hold slit plates and color filters. The optical set
includes Acrylic Blocks, set of three mirrors, 2 slit black plates,
one with three narrow slits at one end and one narrow slit at the
other end. Another black plate with four narrow slits at one end,
one wide slit at the other end & set of seven mounted color filters.
OPTICAL BENCH EISCO
Single aluminium channel accurately graduated fitted on two
sturdy metal feet with levelling screws. Four special designed
heavy sliders having fine index marks. Two of the sliders are
having fine transverse slow motion arrangement. Complete with
four accessories (two lens holders, one optical pin and one object
Screen).
ADVANCED SPECTROMETER- EISCO
This instrument whilst robust enough for individual student use in
also intended for more advanced work. The general finish of the
apparatus is similar to that of the intermediate model. The
instrument is mounted on a baseboard which fits into a polished
hardwood case.
Scale, the 150 mm. diameter circle is fixed, and the table and telescope movements are completely independent of each other. Both movements can be read to 30 sec. of arc by means of double ended verniers. Both rotations have fine adjustment screws, and release of a clamping screw enables coarse adjustment to be made by hand.
Collimator, mounted on fixed and pillar and fitted with 178 mm.
focus achromatic objective, 32 mm. clear aperture.
Telescope, mounted on moveable pillar and fitted with 178 mm.
focus achromatic objective, 32 mm. clear aperture. Also fitted is
an x15 Ramsden eyepiece and a glass cross line graticule.
Prism table, the table is marked with lines to assist placing the
prism with respect to the table levelling screws, and has
interchangeable clamping units for the prism and a diffraction
grating.
