Advice 1: How to make at home compass

Compass – not the kind of thing you can find in every home, but to do it yourself will not be easy. Improvised that will surely be everyone, you can make a simple compass, which will allow you to determine the part of the world.
How to make at home compass
Instruction
1
Take a small piece of foam rubber or foam the size of a matchbox. It will act as a carrier for the arrows of the compass you want to make any needles. Instead of foam you use and the foam. Importantly, the material from which the substrate will be done, not drowning in the water and was easy.
2
Now you need to magnetize a makeshift compass needle with one hand and demagnetize it. If you do not see at home magnets, look around. You will find that on the Cabinet doors, the magnet can be found in the clips that hold the door in closed position. In addition, in any audio dynamics, you can find the magnet, which is one of the major components of the dynamics. Do not have to pull out the magnet. Just hold the end of the needle near the magnet for about a minute – long enough for him to magnetize.
3
The next step is to demagnetize the other end of the needle. This can be done by fire. Use a lighter, matches or a burner of a kitchen stove to lightly heat the tip of the needle (opposite to that which magnetized).
4
Pour into a bowl, deep plate or any other non-metallic bowl with water almost to the brim and down on the surface of the substrate with the needle. Under the influence of the laws of physics, the needle will turn so that one end will face North and South. As you may have guessed, a magnetized end will point North.
Useful advice
If the North front, and South behind, the right is East and the left West.

Advice 2: Foam: how to make it at home

The foam can be done independently at home. You do not even need special equipment. However, as such, self-made, foam may be very mediocre.
Foam: how to make it at home
You will need
  • polystyrene
Instruction
1
To make foam, take a lot of polystyrene balls and fill their container. (Apparently these little balls resemble beads).
2
To the polystyrene balls were glued together, heat them very hot steam. The heat the bulbs produce until, until they begin to swell. After the balloons are inflated, they will approach each other, coalesce and take the form of a container.
3
After cooling, the resulting mass of foam can be considered ready. If you have produced any shape, remove the foam from the tank (capacity in this case will have to dismantle or break). If the foam is suitable for insulation, then leave it in between the walls.
4
To get a real, high quality foam, you will need special equipment and a workshop. Easier and more profitable to produce urea foam.
For manufacturing prepare solution, having dissolved in water at room temperature a blowing agent and a curing catalyst. Start the installation. Pour the foaming agent solution and the resin in the tank. Feed the input of compressed air. Turn on the pumps. Open the taps with the words "solution" and "resin". Pour the resulting penomassu in a special form. Cut and dry foam obtained (this may take up to three days).
Note
The room must be well ventilated as in the production of foam formed toxic substance formaldehyde.

Advice 3: How to magnetize a compass

Like crafts? As well as walking in the woods for mushrooms and berries and to travel? Align your passions and make a compass with his hands. No doubt you will be proud to use it!
How to magnetize a compass
You will need
  • - cut the steel wire;
  • - a small piece of sheet metal;
  • - a box of the cream;
  • - oil paint;
  • - cardboard;
  • - linen buttons;
  • - thick paper;
  • glue;
  • tools.
Instruction
1
Take a round box with a lid. You can take a plastic box of cream or powder. No plastic - take the metal from the Shoe. Otoshita it, remove mill scale and paint with oil paint.
2
With the help of a compass will watertite cardboard bottom (the circle on the inner diameter of the box). Cut it and make a smooth hole in the center with a size of 2 mm. Fasten it to the clothes line button so that the bottom was a projecting part of the button.
3
From construction paper make kartoshku (its diameter is also equal to the diameter of boxes), paint paint and cut. Connected to the bottom, and the bottom set in a box. Make a collar of cardboard and smeared with glue, tightly set in a jar. Firmly press.
4
Make a side below the top edge of the box by 5-6 mm. Cut plexiglass round for glazing the compassand make the center hole and insert the second clothes line button, convex part up. Secure the glazing on the edge with spring rings, made of steel wire. Linen buttons thrust bearings, in which rotates the axis of the arrow.
5
Make the axis arrows of the wire, which can rotate freely in the thrust bearings. The ends of the axis treated with a mill file and a whetstone to sharpen knives.
6
Take a plate, make her the arrow. In the finished arrow to punch a hole that the axle was sitting tight. Take the axle in your hand and check that the arrow is balanced or not. If necessary to file an outweighing the end of the file. Remove the arrow with the axis and magnetize it. First, at one end of the arrow make the needle marking the letter N, then take the magnet and its South pole (usually indicated by a red color) swipe from center to the end of the arrow. Then repeat the procedure on the other hand, only the North pole. Repeat all several times.
7
Set the arrow on the axis – it will occupy a certain position and will show to the North. Install the axle bearings and compass ready.
Note
During Assembly of the compass, ensure that the glass does not slow the cursor movement.
Useful advice
You can use the magnets from the speakers and tape recorders, TVs. They have the shape of a ring, so they should neatly split into several parts with a hammer.
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