The entire belt may be tensioned by a single idler pulley. The drive sprocket is forward, and the conspicuously spoked idler is rear. The sprocket was at the rear, the idler at the front. Each truck has two powered axles, with an idler axle between them. There are usually three shafts&colon; a mainshaft, a countershaft, and an idler shaft. Cable belt conveyors are a variation on the more convention idler belt system. Both gears are stopped and the idler can be inserted between them. Most are belt or direct drive, but some use an idler wheel. The optical resonator serves to resonate at least one of signal and idler waves. This allows net positive energy flow from the pump into the signal and idler frequencies. The purpose of an idler gear can be two-fold. His father, Motilal Chattopadhyay, was an idler and dreamer who held irregular jobs. In 1892, he was chosen by Robert Barr to edit "The Idler" (over Rudyard Kipling). The duo sometimes write a column for "The Idler", a yearly literary magazine. The first of these, "The Gateway of the Monster", was published in "The Idler" (1910).