The Boy Mechanic, vol. 1, page 338
Take a piece of very clear ice and melt it down into the hollow of your hands so as to form a large lens. The illustration shows how this is done. With the lens-shaped ice used in the same manner as a reading glass to direct the sun's rays on paper or shavings you can start a fire. - Contributed by Arthur E. Joerin.
“If you would have light and heat, why then are you not more in the sunshine? If you would have more of that grace which flows from Christ, why are you not more with Christ for it?”
–Isaac Ambrose, Looking Unto Jesus