Head again; and the other day, she looked in the sun. ******************** 7. Combustion by Invisible Rays. The layer of dry air being taken as unity. Radiation through Gases. Name of Machines. Maximum. Minimum. Holmes 1,523 1,523 Alliance 1,953 1,953 Gramme (No. 2). 6,663 4,016 Siemens (Large) 14,818 8,932 Siemens (Small, No. 2) 6,864 4,138 Two Holmes's coupled 2,811 2,811 Two Gramme's (Nos. 1 and 2.