. Engineering and Contracting . towhich they were subjected on this job. The bill for repairson the wagons was accordingly heavy; about double therepair bill for the team-drawn wagons. The reversible type of trailer, where the tractor maychange to the opposite end of a tractor train at the end of atrip, was not used on this job on account of the short haufand because the above type of trailer can not be turnedn-lthin as narrow limits as the cut-under type of wagon. Under usual conditions the tractors easily handled threeof these 3-yd. wagons, but under adverse conditions of wetground and on gr
. Engineering and Contracting . towhich they were subjected on this job. The bill for repairson the wagons was accordingly heavy; about double therepair bill for the team-drawn wagons. The reversible type of trailer, where the tractor maychange to the opposite end of a tractor train at the end of atrip, was not used on this job on account of the short haufand because the above type of trailer can not be turnedn-lthin as narrow limits as the cut-under type of wagon. Under usual conditions the tractors easily handled threeof these 3-yd. wagons, but under adverse conditions of wetground and on grades tor short periods they could handleonly two trailers. On any rough, soft ground or on upgiadeswith loads the tractors were operated in low gear; on level,hard ground or down grades with load, pulling elevatinggradei, or when running light, the engines were operated onintermediate direct-drive gear. High gear was not used atany time. The tractors had to be brought to a stop to changegears as they have little coasting steam Shovel Loading Tractor Trains witli Gravelly Material for Embankment. have 96 in. of ground contact, giving a ground pressure of Tractor Operating CoGts.—Due to the repeated stopping and only 7% lb. per square inch. The machine has three speeds starting of the tractor pulling the elevating grader and the forward and one reverse; at 600 engine speed the time required for dumping and loading the tractor trains, the road speeds are , , and miles per hour forward mileage per day for the machines was low. The following and miles per hour reverse. The drawbar pull on direct tabulation gives average mileage per day, also gasoline and (second speed) is 5,200 lb. and on low (first speed) 8,000 lb. lubricating oil consumption by months. The general design and construction of the engine and „ transmission machinery of the tractor is similar to that of tractor ; gas and oil CONSUIIPtiox. a high-class motor truck, except
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