Harrison Enterprises

Newton's Cradle (Newton Pendulum or executive ball clicker). It is a classic physics demonstration tool used in educational settings and as a desk toy. 

Flask Pattern Brass rod with disc fitted in a wooden/metal case with glass front This item is a Gold Leaf Electroscope, a sensitive scientific instrument used primarily in physics laboratories to detect and identify static electric charges.

This item is a Plug Key Commutator (4-Way), a precision electrical switch used in physics and chemistry laboratories to control, reverse, or route electric current across multiple circuits. It is a foundational tool for teaching fundamental principles of electricity, such as Ohm’s Law and circuit connections. 

Used for sudden make or break of two electric circuits at a time. Two strips and four terminals mounted on a Bakelite plate of high insulation. Contact Resistance: 2 milliohms approx Maximum current: 5 amps Dimensions: L X B X H 130 X90 X40MM