Amtech India's Spring Constant Apparatus / Force Constant apparatus consists of a spiral spring about 25 mm in diameter and 10 cm long. The upper end of he spring is suspended from chucknut and lower and is provided with small pointer which moves over a vertical wooden meter scale. The lower end is also provided with hook for carrying weights. Complete setup is Supported by a heavy Cast iron metal base and 50 gm x 5 Slotted weights.
Reflection of Sound Apparatus demonstrates that angle of incidence and reflection are equal for any setting. Iprotector is screen printed on a superior quality laminated board. It incorporates a protector printed on a wooden board and two independent arms containing 12” long stainless steel pipes. One arm is set at any arbitrary angle and other is adjusted till one listens to the maximum sound. At the position of maximum sound to angles will be equal as indicating by the “D” reading.
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