Light dispersion, spectroscopy


 

 

 

   

NEWTON'S DISC

 
 School
  Pellegrini,   Castelvž

  Function
  To show that white light can be obtained as the sum of the rainbow colours.
Maker: Unsigned Price: L 40 Purchase date: 1926

  Description
  The disk is formed of various sectors painted with the rainbow colours. It is used with the rotating machine. Because of the persistence of the image on the retina, the various colours superimpose giving the sensation of the white.

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EQUILATERAL PRISM

 
 School
 University (1),   Spano (2)
(2)

  Function
  To study the dispersion of light.
Maker:
(1) Unsigned
(2) Officine Galileo - Florence
Price:
L 40
L 170
Purchase date:
Cat. 1882
1931

  Description
  The support has a variable height and it leans on a heavy basis that assures the stability of the prism.   The prism is 8 cm long with a 3 cm section side. It is friction turning on its axis, hinged at right angle, and can assume any position.

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RECTANGULAR PRISM

 
 School
  University

  Function
  To study the dispersion of light.
Maker: Unsigned Price: L 40 Purchase date: Cat. 1882

  Description
  The support has a variable height and it leans on a heavy basis that assures the stability of the prism.   The prism is 8 cm long with a 3 cm section side. It is friction turning on its axis, hinged at right angle, and can assume any position.

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POLYPRISM

 
 School
 University( 1),   Spano (2)
(2)

  Function
  To study the dispersion of light.
Maker:
(1) Unsigned
(2) Officine Galileo - Florence
Price:
L 27
L 225
Purchase date:
1918
1931

  Description
  The support has a variable height and it leans on a heavy basis that assures the stability of the prism.   The polyprism is composed of four kinds of glass with a different dispersive power.

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HOLLOW PRISM FOR LIQUIDS

 
 School
  Spano

  Function
  To study the refraction.
Maker:
Officine Galileo - Florence
Price: L 650 Purchase date: 1931

  Description
  The prism is cut from a block and has a cylindrical cavity connected to an opening closed by a tap polished with emery. The lateral sides are represented by two plates with perfectly parallel sides, which are worked in such a way on the planes that they stick to the prism sides by simple pressure.

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ACHROMATIC PRISM

 
 School
  Spano

  Function
  To explain the functioning of the achromatic lens.
Maker:
Officine Galileo - Florence
Price: L 200 Purchase date: 1931

  Description
  It stands on a support with variable height. The two prisms, the crown one , with a 15 degrees 15 minutes angle, the other in flint, with a 8 degrees 6 minutes, both calculated on the basis of the glass quality that is used. They are held by a horizontal plate and stuck on two columns turning on their axis. By using the two prisms separately, we notice the images of the objects appear displaced and coloured on the edges. If we use them in pair, we still have the deviation across the two prisms, but we do not obtain the colouration.

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CONICAL PRISM

 
 School
  Spano

  Function
  To study the dispersion of light.
Maker:
Officine Galileo - Florence
Price: L 280 Purchase date: 1931

  Description
  The conical prism produces a spectrum similar to that of the rainbow.

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DIRECT VISION SPECTROSCOPE

 
 School
  Spano

  Function
  To study the spectrum of a luminous source.
Maker:
Officine Galileo - Florence
Price: L 190 Purchase date: 1931

  Description
  Small school model with Amiciís prism, a variable slit, an achromatic field lens and an eye achromatic lens.

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HAND SPECTROSCOPE

 
 School
  University

  Function
  To study the spectrum of a luminous source.
Maker: Unsigned Price: L 135,63 Purchase date: 1908

  Description
  It is formed by two tubes one sliding inside the other. In the first we have a slit, while in the second we have a lens and a prism of Amici. The light passes across the slit and goes to the prism by which it is dispersed without deviation.

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KIRCHHOFF AND BUNSEN SCHOOL SPECTROSCOPE

 
 School
  Spano

  Function
  To study the spectrum of a luminous source.
Maker:
Officine Galileo - Florence
Price: L 1300 Purchase date: 1931

  Description
  It is supplied by a flint (n=1.64) equilateral prism. The tube has a photographic scale with a mobile prism and an achromatic lens. The telescope has a friction ocular.

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KRÜSS' SPECTROMETER

 
 School
  University

  Function
  To study the spectrum of a luminous source.
Maker:
A. Krüss - Hanburg
Price: L 675 Purchase date: 1887

  Description
  The instrument is made in brass and it is formed by a disk held by a large pole that stands on a tripod with level screws.
  The fixed collimator and the tourning telescope are placed at the ends of two branches held by the central pole. The branches can turn around the pole.
  The prism is place on the centre of the disk.

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SPECTROGRAPH

 
 School
  University

  Function
  The spectrograph is an instrument that record on a plate (spectrogram) the spectrum of the radiations under examination.
Maker:
Adam Hilger - London
Price: Purchase date:

  Description
  The spectrograph is an instrument that records on a plate (spectrogram) the spectrum of the radiations under examination.
  It is particularly useful in the spectrography of the infrared and of the ultraviolet because we can use plates sensible to these radiations.
  The light goes into the collimator, crosses a prism and another collimator lens to arrive at a camera obscura. Inside this there is a fix frame on which another mobile slides vertically and on wich the plate is put.

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SPECTROMETER

 
 School
  University

  Function
  To study the spectrum of a luminous source.
Maker:
Adam Hilger - London
Price: Purchase date: 1919

  Description
  Spectroscope at wavelength with constant deviation.
  The collimator and the telescope are placed on the U shaped branches of a basis held by a pole placed on a tripod. Between the collimator and the telescope the prism is placed, covered by a cylindrical shell with two holes.
  The focusing is obtained by changing the position of the collimator thanks to a micrometric screw.

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LUMMER-GEHRCKE SPECTROMETER

 
 School
  University

  Function
  The interferential spectrometer is an instrument to study the fine structure of the light spectre.
Maker:
Adam Hilger - London
Price: Purchase date: 1919

  Description
  The collimator and the telescope are placed on the branches of an L form basis supported by a pole that rises from a tripod. Between the two instruments we have the prism covered by a cylindrical container with two windows in correspondence of the collimator and of the telescope. We place the plate between the telescope and the prism.
  We can have the sharp image by varying the position of the telescope with a manometric screw.
  After crossing the collimator the light goes into a rectangular prism that disperses it. Then, it arrives with a certain inclination on a glass plate by which it is in part reflected and in part refracted.
  In this way we have two rays that arrive on the eyepiece where we can see the interference fringes.
  The study can regard only on spectre line if, before, we make the light pass through another spectroscope.

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SPECTROPHOTOMETER

 
 School
  University

  Function
  To study the spectrum of a luminous source.
Maker:
Schmidt & Haensch - Berlin
Price: L 500 Purchase date: 1914

  Description
  The instrument is used the light absorbed or reflected by a body in function of the wavelength.
  It is used in chemistry for the qualitative and quantitative analysis of substances.

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