You may find this easier to use a ruler and mark out a cross in the larger circle first this will give you a guide to the most central position to place the lens before drawing around it. Place the small lens onto the center of this circle and draw around this too.Mark a circle onto the piece of cardboard by drawing around the inner tube.There are many different ways to make your own telescope, but the fundamentals are always going to be relatively similar. Need to see a little further? Why not have a go at building a homemade telescope that’s slim enough to slip into a backpack, no problem. Good luck on your mission, and I hope you have a successful stakeout! Building a Homemade Telescope For the ultimate secret stakeout, you may want to consider camouflaging your periscope with a little of its surroundings.It’s a good idea to paint your periscope in a neutral color or something that will blend into its surroundings, I will be using mine outdoors so I went with a rich deep green color.You can tidy them up with a little masking tape if you like. The edges of the periscope can sometimes end up looking a bit untidy in the places where you scored it.Glue and insert a mirror into each opening of the periscope.Glue the flaps at the end of the periscope down.Fold the periscope over to make a tube, glue and secure with masking tape if needed.Folding over the ruler will help keep the folds straight.

Using the ruler as a guide, ask an adult to score down the dotted lines with the craft knife.

Once the glue has dried carefully cut out the template along the solid lines being careful not to cut off the end flaps.

If you are using a cereal box to make your homemade periscope and intend to paint it, then it really doesn’t matter which side you glue the template onto, the main thing here is that the template is well glued down.

Print off the Periscope template and glue it onto the cardboard.Large cereal box or an A4 size or larger piece of cardboard.

How to be a spy agent kid