Safety. Its use should be attended by a minimum of danger. Suitable design, proper proportions, sound materials and careful construction are essentials.
Durability. It must be made to withstand hard use and all kinds of weather. To demand a minimum of repair means also to afford a maximum of security.
[A-1]Dr. E. H. Arnold, "Some Inexpensive Playground Apparatus." Bul. 27, Playground Association of America.
[A-2]Dr. E. H. Arnold, "Some Inexpensive Playground Apparatus." Bul. 27, Playground Association of America.
The city yard equipped to give a maximum of exercise and creative play
