Plan, Design and Build a Dolly pot; hand powered rock crusher
One common primitive rock crusher is the arrastra, a device which has been used by miners for centuries. An arrastra is a rock lined pit that is dug out around a whim. A horse, mule or donkey is hitched to the whim and a large boulder is drug around the pit in a circle. Rich ores are added to the pit and they are crushed as the large boulder is ...