1. IN A MOBILE SAWMILL, IN COMBINATION, AN ELONGATE HORIZONTAL BASE FRAME PROPORTIONED AND ADAPTED FOR TOWED TRAVEL AS A TRAILER ON PUBLIC HIGHWAYS, SAID FRAME COMPRISING FLANGED STRUCTURAL STEEL LONGITUDINAL AND TRANSVERSE MEMBERS TERMINALLY INTERFITTED AND WELDED AND HAVING INBOARD THEREOF LENGTHWISE ALONG ONE SIDE A SIMILARLY CONSTRUCTED STATIONARY LOG-HOLDING TABLE AND ALONG THE OTHER SIDE A SAW CARRIAGE TRACKWAY, A SAW CARRIAGE MOVABLE ALONG THE TRACKWAY, SAID CARRIAGE COMPRISING A GENERALLY RECTANGULAR STEEL FRAME OF BUT APPROXIMATELY HALF THE WIDTH OF THE SAWMILL BASE FRAME AND HAVING AT A LEVEL ADJACENTLY ABOVE SAID BASE FRAME A PLATFORM CARRYING AT ONE END A BANDSAW HEAD AND IN BALANCING RELATION AT THE OTHER END A SELF-CONTAINED POWER PLANT WITH A SAWYER''S STATION BETWEEN THEM, SAID CARRIAGE TRACKWAY HAVING A LENGTH FOR MOVEMENT OF THE BANDSAW HEAD BY THE CARRIAGE BETWEEN POSITIONS BEYOND THE OPPOSITE ENDS OF LOGS OF MAXIMUM LENGTH FOR THE GIVEN SAWMILL, SAID BANDSAW HEAD COMPRISING A VERTICAL FRAME COMPRISING UPRIGHT PILLAR PLATES EXTENDING IN PARALLELISM TRANSVERSELY OF THE CARRIAGE AND CLOSELY SPACED IN THE DIRECTION OF CARRIAGE TRAVEL FOR CONFINING BETWEEN THEM CORRESPONDINGLY SHORT UPPER AND LOWER SHAFTS FOR SUPPORTING DRIVING AND DRIVEN PULLEYS FOR A BANDSAW THEREON, A DIRECT ALIGNED DRIVE SHAFT OPERATIVELY CONNECTING THE POWER PLANT AND THE DRIVING SAW PULLEY, HYDRAULIC TRAVERSING DRIVE MEANS FOR AND ON THE CARRIAGE AND PRESSURE ENERGIZED FROM SAID POWER PLANT INDEPENDENTLY OF THE BANDSAW DRIVE, AND CONTROL VALVE MEANS AND AN OPERATING MEMBER THEREFOR ACCESSIBLE TO A SAWYER RIDING AT SAID STATION OF THE CARRIAGE WHEREBY TO ORDER TRAVEL OF THE CARRIAGE IN EITHER DIRECTION AT WILL AND AT RATES VARIABLE BY ANY DESIRED INCREMENTS.