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.
An ordinary strap hinge can be applied to a door or box cover in such a way that only one wing will show. Ordinarily the hinge opens as at A, and. on reversing it, the hinge will open to the limit as shown at B. If one wing is bent toward the other, as shown at C, the hinge may be applied as shown at D. As this process reverses the hinge, the screw holes must be countersunk on the opposite side.
Ill: Reversing a Strap Hinge So That When It is Applied Only One Wing will Show