By David Russell, reporter at OptionMonsterNEW YORK -- Dresser Rand ( DRC) is an oil-equipment name, and it was discovered by the energy bulls Monday. OptionMonster's tracking programs detected the purchase of more than 2,000 September 70 calls, most of which priced for $1.80. Volume was more than 30 times open interest at the strike, indicating that new money was put to work on the long side. Long calls lock in the price where shares can be purchased, so they have the potential to generate significant leverage from even a modest rally. A 20% gain in the stock price, for instance, would result in a profit of almost 100%. The contracts also spare the investor the difficulty of timing an entry. Dresser's shares rose 0.13% to $61.47 Monday. Last month the stock fell to its 200-day moving average, then bounced, and it has been holding its ground near the all-time high of $63.41 achieved in February. Total option volume was four times greater than average in the session, with calls outnumbering puts by 50 to1. Russell has no positions in DRC.