I am a power of one hundred and fifty pounds of steam, up to one hundred and sixty po

I am a power of one hundred and fifty pounds of steam, up to one hundred and sixty pounds of pressure, and can be graduated down to forty pounds. I can be employed in driving a hammer, at low pressure, up to sixty pounds of steam, and down to fifteen pounds. I can be employed at high pressure, up to one hundred and sixty pounds, and down to forty pounds. I can be employed at low pressure, up to forty pounds, and down to fifteen pounds. I can be employed at high pressure, up to one hundred and sixty pounds, and down to forty pounds. I can be employed at low pressure, up to forty pounds, and down to fifteen pounds. I can be employed at high pressure, up to one hundred and sixty pounds, and down to forty