“In my school-days, if a boy crossed his fingers, elbows, and legs, though the act might not be noticed by the companion accosted, no blame was attached to the falsehood.”
New York city.

“In my school-days, if a boy crossed his fingers, elbows, and legs, though the act might not be noticed by the companion accosted, no blame was attached to the falsehood.”
Source: Current Superstitions (1896), entry 69.
Fanny D. Bergen, editor.
Modern normalized navigation; the historical attribution above remains unchanged.