CAMERA AND ROCKET INVENTION

Camera

The inventor : Louis Daguerre
Situation : There was obscular camera, but it just reflects the view and it can’t be printed. It needs a painter to paint again according to the reflection.
How to do the experiments : First, Daguerre coated a copper plate with silver, then treated it with iodine vapour to make it sensitive of light. The photograph can be developed if it is affected by mercury vapor.
What is it used for : It is used to make a real image in a paper that is more real and clear than a painting.

Rocket

The inventor : Robert Goddard
Situation : There was a World War One and he made the military rocket for use as weapons that were launched from lightweight hand launchers.
How to do the experiments : First, his rocket powered by gunpowder, but the gunpowder wouldn’t work for the rocket, it is not strong enough to pushed it. Finally, he decided to use liquid oxygen and hydrogen.

What is it used for : It is used for fly and have a research to the moon, Mars, Jupiter, Sun etc. It also used for take photograph of the planet, satellite and the galaxy.

How to make a model liquid fueled rocket:
You need :
• An empty wine bottle and cork
• baking soda
• tissue paper
• vinegar
What you do:
1. You take the wine bottle and put a half cup of vinegar in it.
2. Then you take it outside roll up a teaspoon of baking soda in the tissue paper.
3. Drop the packet of baking soda in the bottle and quickly stick in the cork; wait awhile; the cork will fly through the air.