THE PHILOSOPHY OF PLANTS. COMPRESSED AIR RECOIL CYLINDERS FOR HEAVY MORTARS. EFFECT OF DIFFERENT COLORED LIGHT RAYS UPON PLANT LIFE. MORTAR IN THE LOADING POSITION. MORTAR ELEVATED FOR FIRING., scientific american, 1897-01-02
THE PHILOSOPHY OF PLANTS. COMPRESSED AIR RECOIL CYLINDERS FOR HEAVY MORTARS. EFFECT OF DIFFERENT COLORED LIGHT RAYS UPON PLANT LIFE. MORTAR IN THE LOADING POSITION. MORTAR ELEVATED FOR FIRING., scientific american, 1897-01-02
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