Metal employed for 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 Gramme (No. 2). 6,663 4,016 Gramme (No. 2). 6,663 4,016 Gramme (No. 2). 6,663 4,016 Gramme (No. 2). 6,663 4,016 Gramme (No. 1). 6,663 4,016 Siemens.