1605. Spectrometer 'RAC' Model
In cabinet as described but scale graduation1/3° in and vernier constant 20 second.
Spectrometer Two Verniers Design to give Maximum Accuracy
Protected circle read by two opposite verniers to one minute or thirty seconds of Arc. Scales are divided on precision machine. The Telescope and Collimator are held in support rigidly and in perfect alignment. They are fitted with 175 mm. F. I. achromatic objectives and have rack & pinion focusing. Telescope fitted with Ramsden eyepiece and Collimator with adjustable slit with stainless steel jaws.
Telescope and prism tables are fitted with coarse and fine adiustments. Complete with Prism Holder, Diffraction Grating Holder.

1606. As above with vertical adjustment by thumb screw. 6" scale Ver 1" or 30 Sec.

1607. Spectrometer 6" - Scale of stainless steel

1608. Spectrometer Protected Circle 7" of Brass with Vernier constant 30 sec. or 1 minute.

1609. Spectrometer Protected, Circle 7" dia but, of stainless steel scale with vernier constant, 30 seconds or 1 minute.

1610. Spectrometer Research type
Protected Circle about'. 230 m.m, dia divided on 1/3 divisions accuracy of Calibration within ±0.001% two opposite verniers to read 20 second or 30 seconds of the arc. Finest achromatic optics of 1¼" dia & 9" focal length with Gauss Eye piece.

1611. Spectrometer Research type With scales and veniers Stainless Steel

1612. Spectrometer Graduated Scale of 125 mm. dia and vernier reading 1 minute.

1613. Spectrometer with Scale of 125 mm. dia but scale-verniers are of Stainless steel.

1614. Spectrometer with Scale 6" or 150mm. dia & vernier reading 1 minute or 30 seconds.

1615. Spectrometer Scale of 6" but of Stainfess Steal.

1616. Spectrometer but Scale of 7" dia of Brass with vernier constant 1min. or 30' sec.

1617. Spectrometer Scale of 7" dia. but scale and vernier are of Stainless steel, & Vernier constant 1min or 30 Sec.

1618. New Intermediate Spectrometer
Accurate but simplified model for student use.
Telescope vernier reads to 1' of arc.
A model for student use, with an optical system equivalent to that more advanced models, thus permitting many quantitative experiments.
Graduated disc 127 mm. diameter fixed to table, double ended vernier, to read to l' of arc, attached to telescope. Both telescope and table have fine-adjustment screws and release of clamping screw enables coarse adjustments to be made by hand.
Telescope and Collimator are fitted with 178 mm. focal length, 25 mm. app. aperture achromatic objectives and have rack and pinion focusing: telescope fitted with x15 Ramsden eyepiece and cross-line reticule: collimator with adjustable slit, length 6mm; mounting of telescope and collimator permits accurate levelling of axis and squaring to axis of rotation.


telescope fitted with x15 Ramsden eyepiece and cross-line reticule: collimator with adjustable slit, length 6mm; mounting of telescope and collimator permits accurate levelling of axis and squaring to axis of rotation.
The spectrometer table, marked with lines to assist positioning of prism in relation to leveling screws, has interchangeable clamping units for prism and diffraction grating.
Complete. As specified, in wooden case with the following accessories:
a) 1 Spectrometer prism;
b) 1 Prism clamp;
c) 1 Diffraction Grating Holder:
d) 1 Watchmaker's Eyeglass;
e) 1 Tommy Bar for adjusting optical axis

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