River Station Surveying  Survey crew field office Split Leg Tripod holding a Kolesch & Co. plain transit Survey crew sighting scope Grading a 2% slope for the stone ballasted railroad bed from the C G & P main line to River Station Note the F. C. Austin Reversible Road Machine with 2-horse team in the background Survey work at the settling reservoir Typical marker Providing accurate construction marks for layer 1 of 12 on the caisson deck floor Preparation for building the main aqueduct

  River Station Surveying