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"Place a bar of iron and a similar one of copper end to end so as to be heated equally by the flame of a lamp. Fasten small balls by wax to the under surfaces of the bars at eqiual distances apart. More balls will be melted from the copper than from the iron." -Avery 1895

Difference of Heat Transference Between Copper and Iron

"Place a bar of iron and a similar one of copper end to end so as to be heated equally by the flame…

"In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference of energy." -Avery 1895

Man Using Lever and Fulcrum to Lift Rock

"In mechanics, the word 'machine' signifies an instrument for the conversion of motion or the transference…