Make the following two simple sentences into single complex sentence!
1. Tools holders are specially made for clamping of small tools. Tools holders are manufactured of cheap mild steel.
2. The lathe bed carries all lathe parts. The lathe is supported by the pedestal.
3. Steel is much stronger than wood. Steel is more expensive than aluminium.
4. The apparatus consist of a calorimeter. The calorimeter is made of aluminium or copper.
A string is attached to one end of the block and passes over a pulley at the top of the slope. A string is made of nylon.