Sometimes it is very difficult to open a penknife. The spring may be stiff or you may have broken a thumbnail so that you cannot open it in the ordinary way.
Here is a very simple way out of the difficulty.
Take a strip of fairly stiff paper, fold it across at the middle and slip the fold under the blade of the knife. Then, gripping tightly the two ends of the folded paper, pull them up and the knife-blade will will be lifted sufficiently to grasp it and pull it right up.
Now aren't you pleased you read this little post?
This handy little tip is brought to you courtesy of EVERY BOY'S HOBBY ANNUAL, 1931