Sentence:  The curtailment of drilling because of a disruption of the loading cycle is far less likely with the <WSD>jumbo</WSD> than with post and tripod drilling, because from three to five working places are available to the <WSD>jumbo</WSD>, whereas only one or, at the most, two faces can be worked by one crew with the old method. 
Meaning of the word marked with <WSD> tags:  A platform-mounted machine for drilling rock.