Samuel Evans Clark, Learn to Invent, First Steps for Beginners Young and Old
“ A life preserver, say of oiled goods, with a spring inside, flat, the size of a plate when operated, three feet long and able to float a person. Convenient fasteners for room doors with poor locks, burglar alarms and portable fire escapes, all worth their weight in gold when required. A few poles and strands of wire, an electrically controlled carriage and an operator would drop a life preserver every few feet of the bathing surface. They are all good subjects for the people in the troubles, but you would go to bed hungry trying to sell the goods. ”
