You Will Need
- Plastic tube/pipe or long tin tube
- transparent polythene or plastic glass
- Silicon glue or elastic band
Plastic tube/pipe or long tin tube (from a brewing kit for example) – ideally 30-45cm long. If using a tin, remove both ends, smooth sharp edges and cover with waterproof tape.
Place transparent polythene over one end of the tube. You could also use rigid plastic glass. Cut it slightly larger than the hole in your pipe and glue it to the end of the pipe with silicon glue.
If using polythene, place an elastic band around it to hold it tightly and taut over the end of the pipe. You should now have a pipe with a clear plastic window at one end.
Lower the plastic-covered end of the device into clear water – and enjoy the view. Use on a sunny day for the clearest views and be careful not to cast your shadow over the viewer.
Illustrations by Alan Batley