This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
A garden roller for digging the earth and crushing clods is easily made of the following material: One round piece of wood, 10 in. in diameter and 18 in. long; two pieces of wood, each 56 in.
long, 2 1/2 in. wide and 1 1/4 in. thick; one piece, 21 in. long, 2 in. wide and 1 in. thick; two 1/2-in. lag screws, 6 in. long, and a quantity of 8-penny nails.
Ill: A Roller for Crushing Clods and Digging the Earth in Garden Making
The short piece of wood is fitted between the two long pieces with tenon-and-mortise joints to serve as a handle at one end and the roller is fastened between the side pieces at the opposite end to revolve on the lag screws. The nails are driven into the roller so that they project about 1 in.