Statics of solids


 

 

 

 

   

BOARD FOR THE PARALLELOGRAM OF FORCES


  Function
  To study the resultant of coplanar forces.
Maker:
Paravia - Turin
Price: L 150 Purchase date: 1928

  Description
  It includes a polished mahogany circle table, to which we can apply three chucks with pulleys. On the throat of these pass three flexible threads, linked at one end to a light ring. At the other end of the three threads we apply variable weights, two of which represent the component forces and the other the resultant. The chucks also fix the graph of the composition of the forces on the table.
  With the apparatus we find joined a set of twelve equal brass weights with hook and eyelet tosuspend them in cascade, and two graphs in case the components form a right angle, and in case two components have directions at acute angle.

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APPARATUS FOR THE COMPOSITION OF PARALLEL FORCES


  Function
  To study the resultant of parallel forces.
Maker:
Officine Galileo - Florence
Price: L 20 Purchase date: 1934

  Description
  A light aluminium bar is divided into twelve equal and separated segments by brass eyelets. It is held by two flexible threads that pass through the throat of the equal pulleys, mounted on two parallel columns with variable height. Two weights equal to half weight of the bar hold it in equilibrium in horizontal position.
  By applying two forces (components) under the equilibrating weights, we can find the resultant represented by the weights that we must apply to one of the eyelets to hold the bar in equilibrium and in horizontal position. In this way we verify the law of the composition of parallel forces.
  The apparatus is set on a walnut basis and it is furnished with a set of twelve equal brass weights with hook and eyelet to arrange them in cascade.

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PULLEYS AND SET OF PULLEYS


  Function
  To study the power and the resistance of fixed, or mobile pulleys, the three-couple tackle in the same plane and the three-couple tackle on the same axis.
Maker:
Officine Galileo - Florence
Price: L 370 Purchase date: 1931

  Description
  The painted zinc pulleys are held by brass flasks with steel axes. They move with negligible friction.
  We can verify that the power equals the strength in the fixed pulley; in the mobile pulley the power is half the strength, and in the other compound types, the power is a sixth of the strength.
  By hanging a scale to the horizontal bar of the support, and reading the vertical shifts of the application point of the power and of the strength, we can verify that in every case the work executed by the power is equal to that required by the strength, and that the engines create or multiply do not the work, but only modify the two factors that determine it. A set of twelve equal weights to be applied to the support is given along with the apparatus.

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INCLINED PLANE


  Function
  Simple machine.
Maker: Unsigned Price: Purchase date:

  Description
  The inclined plane is formed by a hard wooden table hinged to another table that is used as basis. At the other end of the table there is a pulley.
  A metallic graduated arc is used to read the angle that the inclined plane forms with the horizontal plane.

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WOODEN MODEL OF SCREW AND NUT


  Function
  Simple machine derived from the inclined plane.
Maker:
Officine Galileo - Florence
Price: L 11.50 Purchase date: 1931

  Description
  The two pieces are cut in hard wood. The nut is divided into two parts.

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WOODEN MODEL OF VERTICAL WINDLASS


  Function
  It allows raising great weights with small forces.
Maker:
Paravia - Turin
Price: L 35.50 Purchase date: 1928

  Description
  Simple wooden machine.

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WOODEN MODEL OF WINCH


  Function
  It allows raising great weights with small forces.
Maker:
Paravia - Turin
Price: L 35.50 Purchase date: 1928

  Description
  Simple wooden machine.

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APPARATUS FOR FINDING THE CENTRE OF GRAVITY


  Function
  Research of the centre of gravity.
Maker:
Paravia - Turin
Price: L 92 Purchase date: 1928

  Description
  Apparatus used for the research of the centre of gravity. It is composed of a support with plumb line, a lateral hook, and a tip at the top to control the centre of gravity. The figures are hanging from the lateral hook that the apparatus is provided with.

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ARTICULATED PARALLELEPIPED


  Function
  To study the condition of equilibrium of leaning bodies.
Maker:
Paravia - Turin
Price: Purchase date: 1928

  Description
  With the little pendulum applied to the centre of gravity we verify the condition of equilibrium of leaning bodies.
  The parallelepiped is formed by three wooden, equidistant and parallel planes articulated by four thin wooden bars, that form the lateral edges.

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CONE


  Function
  To study the stable, unstable, or neutral equilibrium for leaning bodies.
Maker:
Paravia - Turin
Price: Purchase date: 1928

  Description
  If we lay the cone on the base we obtain a stable equilibrium. If we lay it on the top we obtain an unstable equilibrium and if we lay it on the lateral surface we obtain a neutral equilibrium.

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DOUBLE CONE WITH INCLINED PLANE


  Function
  Mechanical paradox. To show that the centre of gravity tends to the lowest possible level.
Maker:
Paravia - Turin
Price: L 34.50 Purchase date: 1928

  Description
  The double cone of polished wood apparently climbs on the inclined plane.

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