Pages Navigation Menu

Showcases

SCALES WITH A WEIGHT SET

Posted by on 06-04-2015 in Mechanics | 0 comments

SCALES WITH A WEIGHT SET

Number in the past inventory 2837 Number in the current inventory 21 INSTRUMENT: SCALES WITH A WEIGHT SET Age: beginning of the twentieth century Creator: / Materials: Cast iron, copper, iron Size: (390x165x130) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2837 on 26th June 1928 priced at 750 liras. Description: The instrument consists of a rectangular base made of cast iron, on which the yoke of the scales rests. The yoke has arms of the same length and a knife which goes through its fulcrum. At equal distance from the fulcrum there are two knives fixed in the arms. A complex system of suspension allows the barycenter of the loads on the pans to pass through the midpoint of the respective knives and the weight force to be directed perpendicularly to the knives themselves. The pans are supported by two bars, one perpendicular to the other, which articulate with the yoke of the scales. Those which are turned towards the central knife hold respectively two indicators of balance representing two birds. On the top surface of the base, on the two sides, they are represented as a star and a crown. This instrument comes with a wooden weight set which is incomplete and contains only six weights. Use: This is used for the purpose of measuring and/or as an example of simple...

read more

A SIPHON BAROMETER

Posted by on 06-04-2015 in Mechanics | 0 comments

A SIPHON BAROMETER

Number in the past inventory 3072 Number in the current inventory 301 INSTRUMENT: A SIPHON BAROMETER Age: beginning of the twentieth century Creator: / Materials: Brass, wood and glass Size: (80 X 1160 X 22) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 3072 on 10th March 1924 priced at 600 liras. Description: A U-shaped glass tube with unequal arms is fixed with brass clamps on a wooden rectangular support. The shorter side is closed at the end, the long side ends with a cylinder of larger radius. At the side of the tube there is a metric scale written with ink. On its short side these words are written: “Atmosphären = Druch Volumen –Luft nach Atmosphären- Druch”. There also two symmetrically graduated scales. Use: Mercury is poured into the tube so that initially the level corresponds to the zero line marked on the scales. In the closed side a certain volume of air at atmospheric pressure will remain confined. Adding the mercury in order to reduce in half the volume of the air the difference in height between the two branches is measured and this will be equal to 76cm. That means that doubling the pressure the volume will be reduced by a...

read more

A BAROGRAPH

Posted by on 06-04-2015 in Mechanics | 0 comments

A BAROGRAPH

Number in the past inventory 2892 Number in the current inventory 81 INSTRUMENT: A BAROGRAPH Age: beginning of the twentieth century Creator: P.G. Garofalo Ottici, Palermo, Italy Materials: Wood, paper, mercury, glass, brass, ivory Size: (146 x 290 x 177) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2892 on 28th May 1942 priced at 6,750 liras. Description: The instrument is kept in a wood box with glass side walls, with a brass handle and a label where it is written: “Barometro olosterico di precisione P.G.Garofalo Ottici Palermo” The holosteric barograph consists of a round metal box with a flexible and corrugated cover. The box is empty. The instrument is made up of a holosteric baromether made of a lot of metal small boxes, one on top of the other. The system is connected by a lever to an index which ends with a pen resting on a piece of paper rolled on a metal cylinder. Inside the cylinder there is a clockwork movement which makes the cylinder spin. The column of the little boxes is connected by a rod to a metal sheet folded upon itself and connected by a system of levers to an indicating pointer. Next to the cylinder there is a thermometer graduated in Celsius and Reaumur. On the index support there is written “Barometre holosterique”. The number 228 and a circle with the letters H B N P placed crosswise are engraved on the inside base of the box covered with brass. A corrugated paper box containing strips of recording paper to roll up on the cylinder is part of the kit of this instrument. Use: The box changes its shape because of the pressure variations and the movement is transmitted to the pen which records the pressure gait. There is a paper strip for each day of the week and each one has a pressure scale, so you can study the atmospheric pressure gait of a specific place when the weather...

read more

A WOODEN CAPSTAN

Posted by on 06-04-2015 in Mechanics | 0 comments

A WOODEN CAPSTAN

Number in the past inventory 2829 Number in the current inventory 10 INSTRUMENT: A WOODEN CAPSTAN Age: beginning of the twentieth century Creator: / Materials: Wood Size: (420 x 320 x 250) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2829 on 26th June 1928 priced at 460 liras. Description: On a rectangular frame a cylinder is fixed, free to rotate around its axis. At the end of this axis there is a small cylinder with 4 bars which radiate from it. The balance of the system is ensured by two wooden arcs fixed on the lower part of the frame, and on the top by another bar through which the axis of the bigger cylinder goes. Use: It is a model of a simple machine. It serves to determine different mechanical advantages. It differs from the winch because the axis of rotation is vertical and not...

read more

MASON’S LEVEL

Posted by on 06-04-2015 in Mechanics | 0 comments

MASON’S LEVEL

Number in the past inventory 2841 Number in the current inventory 25 INSTRUMENT: MASON’S LEVEL Age: beginning of the twentieth century Creator: / Materials: Wood, iron, brass Size: (300 x 300) mm State of conservation: Excellent Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2841 on 26th June 1928 priced at 450 liras. Description: The instrument is made of two wooden bars 11 mm thick, stuck at right angles. Its free extremities are sectioned at 45 degrees and support the instrument on a level surface. Between the two bars there is a wooden arc of circumference, on which brass graduated scales are screwed, with zero in the centre, from 30 degrees to +30 degrees, divided into sections of 2 degrees. Along the junction line of the two bars a screw has been inserted, around which a brass coupling can freely rotate. A pendulum is welded to the brass coupling. The pendulum is made up by a small iron rod 148 mm long and a brass disc of Ø 38 mm and 5 mm thick. Use: It is used to identify a horizontal direction or to check the horizontal position of a line: the position of the plumbline against the point in the middle of the arc of circumference measures the difference as regards the horizontal...

read more

AN APPLIANCE TO DEMONSTRATE BOYLE’S LAW

Posted by on 06-04-2015 in Mechanics | 0 comments

AN APPLIANCE TO DEMONSTRATE BOYLE’S LAW

Number in the past inventory 3077 Number in the current inventory 307 INSTRUMENT: AN APPLIANCE TO DEMONSTRATE BOYLE’S LAW Age: beginning of the twentieth century Creator:/ Materials: Wood, cast iron, mercury, glass, brass, iron Size: (1170 x 260 x 25) mm State of preservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 3077 on 10th March 1924 priced at 9,450 liras. Description: A rectangular wooden base set upright on a cast iron tripod. On the base there are two glass tubes of different lengths and two wooden metrics bars. The short side ends with a tap and a spout, instead the long side ends with a security bubble. The two pipes underneath are inserted in a metal tube with fittings. This tube is closed by another tap with a spout. Use: Mercury is poured into the tube so that initially its level and the zero line marked on the scales correspond. In the closed side a certain quantity of air at atmospheric pressure will remain confined. After adding some mercury in order to reduce in half the air volume, we measure the difference in the level between the two tubes and this will give the measure of the pressure. More specifically, doubling the pressure the volume will be reduced by a...

read more

MORIN FALL MACHINE TO STUDY THE PARABOLIC TRAJECTORY OF A LIQUID

Posted by on 06-04-2015 in Mechanics | 0 comments

MORIN FALL MACHINE TO STUDY THE PARABOLIC TRAJECTORY OF A LIQUID

Number in the past inventory 2825 Number in the current inventory 6 INSTRUMENT: MORIN FALL MACHINE TO STUDY THE PARABOLIC TRAJECTORY OF A LIQUID Age: beginning of the twentieth century Creator: / Materials: Wood, brass and metal Size: (3.46 x 0.86 x 2.95) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2825 on 26th June 1928 priced at 7,000 liras. Description: On a rectangular wooden base, which rests on four adjustable brass supports, there is a metal bowl for the collection of the liquid. On the same base there is a wooden panel, and, on its vertical frame, there is a tube, which links a cylindrical brass container with a tap to an adjustable nozzle. The adjustment lever of the nozzle functions also as a needle for a brass scale, graduated from 0°C to 90°C. Use: Filling the container with liquid and opening the tap you will be able to see on the wooden board the parabolic trajectory of the liquid, which will vary according to the inclination of the...

read more

A WINCH WITH A BRASS WEIGHT

Posted by on 06-04-2015 in Mechanics | 0 comments

A WINCH WITH A BRASS WEIGHT

Number in the past inventory 2828 Number in the current inventory 9 IMSTRUMENT: A WINCH WITH A BRASS WEIGHT Age: beginning of the twentieth century Creator: / Materials: brass, wood, string Size: (215 x 174 x 330) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2828 on 26th June 1928 priced at 1,650 liras. Description: The instrument is constituted of a wooden tripod (one of the side bars is missing) which supports a wooden cylinder free to rotate around its axis which is connected to a brass handle. A string supporting a brass weight (Ø 50 x 80) is fixed to the cylinder with a screw in a position opposite the handle. Use: The appliance is a model of a simple...

read more

A SPIRAL THERMOMETER

Posted by on 06-04-2015 in Thermodynamics | 0 comments

A SPIRAL THERMOMETER

Number in the past inventory 2897 Number in the current inventory 86 INSTRUMENT: A SPIRAL THERMOMETER Age: beginning of the twentieth century Creator: Abraham-Louis Breguet (1747-1823) (A famous watchmaker from Paris) Materials: wood, glass, brass, velvet porcelain, iron, zinc, silver gold, platinum Size: (205, Ø 165) mm State of conservation: Good Information: From the information contained in the old inventory register, found in the school, the instrument is said to have been added to the inventory with the number 2897 on 10th March 1924 priced at 480 liras. Description: On a wooden circular base which rests on three wooden legs, two brass clamps are screwed; they hold up a curved scale, graduated from -10°C to 40°C, with sensitivity of one degree with a curved rod which supports with a clamp a metal spiral. At the lower end this spiral is inserted on a pin fixed to the base. The spiral consists of platinum, gold and silver placed one on top of the other in this order and they are passed to the rolling mill and heated up. To prevent breakage, the foil is fixed in such a way to have platinum on the outside as this metal has the lowest coefficient of expansion, followed by gold with a medium coefficient and by silver with the highest coefficient. The spiral is connected to a pointer (recently substituted) free to rotate. The curved scale and the pin are connected to the bottom of the base to two metal small bars which hold two brass terminal clamps. On the base there is a groove filled with a velvet string on which a glass bell and a porcelain plate are placed; on the outside on the plate these words are written: “Metallthermometer nach Breguet. Gesetzl: geschützt”. Use: The thermometer operates according to differential expansion of three metals forming the spiral which expands due to the effect of the heat or thermoelectric heat (connecting the terminals to a generator) and acts on the pointer. The presence of the bell allows a more reliable and precise measurement of the...

read more