Pulse of the Earth. Drawing, description

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Pulse of the Earth. Children's Science Lab

Children's Science Lab

A seismograph with a vertical pendulum, which we suggest you make, is not a toy, not a model - it was in service with Russian seismic stations in the last century. Making it at school and even at home is quite simple.

On a solid wooden base 1 measuring 65x50 cm, a wooden stand in the shape of the letter "P" is fixed. Under the stand there is a wooden pendulum 2 with a fulcrum at the base of the model. Its height is 29 cm, length - 23 cm, width - 19 cm. An iron shoe is attached to the end of the wedge-shaped part of the pendulum, and a sharp rib is attached to its lower part. With this rib, the shoe fits into a slot-like socket on a metal plate screwed to the base of the device. There are two iron lugs on the upper ledge of the pendulum; the other two are attached to the upright columns of the rack. The ends of two helical springs made of non-hardened steel wire with a diameter of 2 mm enter the holes of all four lugs. The length of the springs in the free state is 1 cm less than the length of the gaps between the ears, for which they are hooked. An iron plate 3 with a slot and a pin is screwed to the upper face of the wooden stand. A recording lever 5 is put on the pin - a tin arrow 30 cm long with a brass plate soldered on its tail for strength. One end of the recording arm is bent down and rests lightly on the upper registration drum 6. and the other, like a fork, covers the pin 7 hammered into the upper part of the pendulum.

(click to enlarge)

The spring motor rotates the lower registration drum 9. The latter, in turn, rotates the upper registration drum. A grooved pulley with a diameter of 8 mm is mounted on the motor shaft, and grooved wheels with a diameter of 9,5 cm are mounted on the drums. The motor has a forward and reverse stroke and operates for 2-3 minutes. Such motors, pulleys and wheels are available in the set of parts "Metal constructor" No. 5. A smoked paper tape is thrown over both drums and glued with its ends.

When demonstrating, shake the floor or table on which the instrument is placed and turn on the motor. From the shock, the pendulum of the device will begin to oscillate, transfer its movement to the recording lever, and the latter will register vibrations on the finished paper in the form of a zigzag line - a seismogram.

Author: P.Nikitin

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