In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be

• A. 0.69 kg/sq-cm
• B. 1.213 kg/sq-cm
• C. 0.313 kg/sq-cm
• D. 0.687 kg/sq-cm
• E. 1230 mm Hg