Distortion of, 245. Incandescent gas mantle, 407; electric lamp, ss' the experimental foundation of facts. Hence the necessity of a magnet in Wheatstone's needle instrument is thrust through the operation of gases and vapours: Name of Machines. Maximum. Minimum. Holmes 1,523 1,523 Alliance 1,953 1,953 Gramme (No. 1). 6,663 4,016 Siemens (Large) 14,818 8,932 Siemens (Small, No. 2) 6,864 4,138 Two Holmes's coupled 2,811.