Graduated disc 127 mm diameter, fixed

to table, double ended vernier,
to read to one min. of arc, attached to telescope. Both telescope &
table have fine adjustment screws & release

of clamping screw
enables coarse adjustments to be made by hand. Telescope &
collimator are fitted with 178 mm focal length, 32 mm clear

aperture
achromatic objectives & have rack & pinion focusing telescope
fitted with 15x Ramsden eye piece & crossline graticule,

collimator
with adjustable slit, length 6 mm, mounting on telescope &
collimator permits accurate levelling of axis & squaring of axis

of
rotation. The spectrometer table, marked with lines to assist
positioning of prism & diffraction grating. Complete in hard wood
case with

following accessories: One prism clamp, one diffraction
grating holder, one watchmakers’ eyeglass, one tommy bar for adjusting
optical axis.

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