MAKE YOUR OWN SPHERETERMINAL Science Hobbyist
Buy a steel worldglobe. Cut a hole in the bottom. Sand off all the paint. A variety of various sizes of metal world globes can be found, including 1in diameter pencil sharpeners which are excellent for building ultratiny rubberband belt VDG machines. 2. BETTER: USE MIXING BOWLS Purchase two metal mixing bowls. Cut a hole in the base of one.