Building a Simple
Lime Kiln at

We cleared a
suitable area of ground in a disused chalk pit near the site of an old lime
kiln.

We hope to use
chalk from Whitlingham to make lime – which could be used to make building
mortar.

**Laying foundations**

To build a new lime
kiln, we first need to make a flat, level, solid rectangular concrete area.

We need to use
shuttering boards to form the concrete. The boards need to be fixed to stakes.

We drove 4 stakes
into the ground to mark a rectangle measuring 1.5 by 2 metres.

One way to make a
square corner is to use a folded ground-sheet or tarpaulin as a template – any
folded flat surface makes a straight line and any folded straight line makes a
right-angle!

We used another
method …

To get
right-angled corners we used a special set of numbers to make a triangle with
sides 3, 4 and 5 units long. This was how square shapes may have been made in
ancient times. A Greek named Pythagorus based a maths theorem on this idea.

We checked the
shape was rectangular by making sure the diagonals were the same length.

The short sides
were 1.5 metres, which is **3** times
half a metre.

The long sides were 2 metres, which is **4** times half a metre.

So the diagonals
needed to be 2.5 metre, which is **5**
times half a metre.

We then drove each
corner stake into the ground until the tops were all level.

Next week we will
scrape the weeds and roots away and level the ground.

Then we will lay
down “hard core” – sand and shingle to make a level base for the concrete

The shuttering
boards we cut this week can then be nailed to the stakes.