International 2021/2022 (Novelties). Nowa Szkoła


Instrument for demonstrating the thermal conductivity (expansion) of different metals HG1015

A device for demonstrating the inertia of bodies HG0106 Rest the plastic ball on top of the plexiglass square which is placed on a vertical post. Release the spring and squ- are shoots. The ball falls into the concave recession on the post and stays at rest on the top of it, as if nothing had happened. Replaced 7-197. • 7.5 "x 5.5" x 6.5 ", 0.9 lb.

A device that demonstrates the linear (thermal) expansion of metals HG0021 This set helps to perform a qualitative comparison of the degree of thermal linear expansion of the three materials: steel, aluminum and brass in the form of rods. This live experiment, thanks to the indicators acting as single-si- ded levers with large leverage, allows the user to clearly assess the relative thermal expansion of the these metals. Structure/Technical description • The set consists of a matel base ( approx. 23 cm x 9 cm x 7 cm) with two brackets, three indicators in different colours (length: 19 cm) and plate holders, scale on brackets, three rods for experiments (steel, aluminium, brass, length: 18 cm, dia. 6 mm), convection limiter and a plate for alco- hol (diameter 7 cm and height 1 cm).

Device with 5 metal rods (arranged in the shape of a star) which allows the students to compare thermal conductivity of aluminium, brass, steel, zinc and copper by melting wax balls at the ends of the rods. Each rod has a notch to hold the wax. Length: approx. 340 mm

Electric motor – model for demonstration HG0071

100 Ohm resistor HG0150

Galvanometer HG0070

This model is a perfect visual aid for demonstrating how the DC electric motors work. This device is made of steel and it is mounted on a stable base. It works freely and quietly. Equipped with two banana sockets for connec- ting a 2 to 4 V power source. • 8,8 x 8,5 x 10,4 cm; material: plastic, metal

The resistor is a simple device allowing to regulate the current and voltage. It has a solid metal case. The con- tact elements with the slider are made of copper-plated graphite. This device ensures good linearity. The scaled graduation from 0 to 100 provides precision. • 28,5 x 14 x 9,5 cm; dia. of the ceramic cylinder: 4,7 cm; weight: 1,2 kg; max voltage: 380VAC, 400VDC; resistor tolerance: +- 10%; insulation resistance: >3x109 ?; grounding resistance: < 0,1 ?;power: 160VA; am- perage: 1,25 A; electrical resistance: 100?;

This sensitive galvanometer is an educational tool which can be helpful in physical laboratories. An analogue me- ter is used to measure very low values of electric current. It is equipped with three sockets with clamps adapted to cables with forks or banana plugs. • 13,3 x 9,7 x 10,2 cm; weight: 165 g; measuring range: -300µA~0~300µA; supply voltage: alternating current 220 V, 240 V; direct current: 24 V; accuracy class: 0,5; working temperature: 10 ~ + 55 oC



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