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"The Cat engine, combined with the new anti-stall hydraulic drive system, gives the PB50 and PB65 increased performance and makes it easier for the new operator to drive like a pro in rough terrain."Both of the Piggy Back machines are highly maneuverable--turning radius is 78 in. and gradability is 50 percent--and can reach speeds of 8 mph. Braking is dynamic and to hold the machine when parked, the front wheels are also equipped with Poclain brakes.The PB50 offers a standard lift height of 86 in. with optional lift heights as high as 165 in. available. Dimensions of the 5890 lb. machine are 96 in. high, 100 in. wide and 136 in. long. The PB65 weighs 7000 lb., and shares the same height and width dimensions, but is 5 in. longer than the smaller machine. Both have a ground clearance of 15 in.

Cold Weather--The temperature of surrounding air is critical for proper brick installation. No brick structure should be ever done when the air temperature is below 28[degrees]F (when temperatures are rising), or 32[degrees]F (when they''re falling). The air temperature must be measured at the point of installation. No frozen materials should be used. On a warm day, bricks should be wet just prior to being laid. However, when the air temperature is at or near freezing, the brick must be thoroughly dry. Laying brick in freezing weather seriously affects the strength of the brick construction. The term ''refractory'' can apply to a plastic or a castable type material. According to ASTM C-64 there are five basic categories of plastic refractory (high duty fireclay, super duty fireclay, 60 percent alumina, 70 percent alumina, and 80 percent alumina). A plastic (meaning molded, or shaped) material will be made from either fireclay or alumina, with the rest made of other materials. According to ASTM C-64 there are two classifications for castable refractory. Either it is an alumina-silica base or an insulating type refractory.