ClipArt ETC
"A contrivance for enabling a person to glide swiftly on ice, consisting of a steel runner fixed either to a wooden sole provided with straps and buckles, or to a light iron or steel framework having adjustable clamps or other means of attachment to a shoe or boot. C is a roller skate in which a plate with rollers replaces the runner." — Whitney, 1889

Roller Skate - Side View

"A contrivance for enabling a person to glide swiftly on ice, consisting of a steel runner fixed either…