What am I?

Cover the clues so you can only see number one. How many clues do you need before you know the answer?

1. I am about 30 centimetres wide and around 25 centimetres high.

2. We were once found on every dairy farm.

3. I am made of wood.

4. A pail or bucket was nearly always close by me.

5. I am no longer needed on a dairy farm but could still be quite handy in a power cut..

Answer in the next TreasureLink.