CAT. No. VE/PHY/00105
Student Spectrometer: The base, integral with the collimator tube support, carries the swinging telescope arm pivoted on a bearing with spring loaded end thrust plates. This type of bearing eliminates any slack which would otherwise develop with wear. The collimator & telescope tubes are one piece precision casting in light alloy, concealed helical action focusing devices are provided. The collimator slit with spring loaded jaws is of a new & robust design which ensures retention of the initial accuracy. The graduated prism table support, 180 mm diameter, is divided in degrees; the vernier, reading to 0.1, is fixed to the telescope arm. This arrangement permits easy estimation to 0.05 from the conveniently positioned vernier scale. The fully adjustable prism table 75 mm diameter is engraved with concentric rings, which facilitates correct location of a prism & has two screwed holes for the attachment of the prism & grating holder, to accommodate a prism upto 25 mm high. Large diameter clamping knob are fitted for movement control & fine adjustment is provided for the telescope. All bright parts are chromium plated with the base & tube in synthetic hammer finish. Overall dimensions 510 x 230 x 220 mm without prism.
Intermediate Spectrometer: Comprises of the following items :
a) Spectrometer: Telescope vernier reads to 1 min. of arc. A model for student use, with an optical system equivalent to that on more advanced models, thus permitting many quantitative experiments. 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.
b) Mercury Vapour Lamp: With holder & choke 80W & 120W.
c) Sodium Vapour Lamp: 45 Watt, 220 Volts
d) Lamphouse & Transformer: 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. The lamp house is open at the top to allow for ventilation & may be removed for operation on a separate stand, as required. The transformer is housed in a two part sheet steel case with ventilation louvres & has a lamp house supplying rod mounted directly onto the transformer case provide a convenient self contained assembly. A 3 core captive flying lead is provided for mains connection.