APPENDIX VI

CHECKLIST FOR DESCRIBING STRUCTURES OF ENGINEERING OR INDUSTRIAL SIGNIFICANCE

RAILROADS, SUBWAYS, AND RELATED RESOURCES

• Dates of construction
• Principal engineers
• Distance (length in miles)
• Terminus points
• Grade: highest and lowest points
• Type of track/gauge (standard or narrow)
• Major buildings and structures along right-of-way that are included within the boundaries
• Historic rolling stock
• Cuts and earthfills
• Dimensions of trolleys
• Power system
• Alterations

ROADS, HIGHWAYS, AND PARKWAYS

• Dates of construction
• Distance (length in miles)
• Principal engineers and, if any, landscape architects
• Topography
• Width of roadway, shoulders, and right-of-way
• Number and type of bridges, culverts, and tunnels
• Major cuts and earthfills
• Grade of highest and lowest points and superelevation
• Surface material
• Types of entrances, exits, and intersections
• Traffic control systems
• Sloping of banks
• Walls, guardrails, and curbing
• Plantings and other landscape features
• Associated buildings within the boundaries, including gatehouses, tollbooths, and refectories
• Viewpoints, pull-offs, overlooks, and observation points
• Significant vistas
• Alterations

CANALS AND WATERWAYS

• Dates of construction
• Principal engineers
• Elevation at terminus points and the summit level
• Number and type of locks
• Source of water supply
• Average speed and type of navigation (steamboat, towpath, or bateau)
• Typical lock dimensions
• Typical boat dimensions
• Wharves and docks
• Lengths in both canalized and slackwater miles
• Historical summary (original aims of company, etc.)
• Alterations

AIRPORTS

• Dates of construction
• Length of runways
• Surface materials
• Principal engineers
• Air traffic tower (dimensions, height, materials, etc.)
• Communications systems
• Hangers
• Terminals
• Historic aircraft
• Alterations

BRIDGES

• Dates of construction
• Manufacturer (if prefabricated)
• Engineers
• Association with particular railroad, road, or other transportation route
• Substructure (structure below deck)
• Height above feature spanned
• Material of abutments and piers
• Deck and superstructure (above deck)
• Type of truss, arch, etc.
• Materials and dimensions of deck
• Materials of superstructure
• Number of spans and lengths
• Construction depth
• Width of road
• Alterations

TRESTLES AND VIADUCTS

• Dates of construction
• Number of spans and lengths
• Engineers
• Association with particular railroad, road, or other transportation route
• Number of piers (bents)
• Materials of construction
• Double or single track
• Manufacturer and/or contractor
• Feature spanned (river valley, gorge, etc.)
• Width
• Major height (water level to deck level)
• Alterations

TUNNELS

• Dates of construction
• Engineers
• Association with particular railroad, road, or other transportation route
• Feature traversed
• Length
• Dimensions of bore
• Double or single track (if a railroad tunnel)
• Materials of construction (liner, portals, etc.)
• Ventilation system
• Engineering problems encountered
• Alterations

LIGHTHOUSES

• Dates of construction
• Engineers
• Approximate dimensions of lighthouse; dimensions at base and top, height of focal plane above sea level.
• Material used in construction: brick, stone, iron, wood-painted, etc.
• Form of lighthouse: conical, octagonal, rod or steel screw pile tower
• Distinguishing architectural details
• Type of illuminant and lenses used: existing and previous source; shape of lantern panes; range of light beam
• Special signaling equipment: fog horns, radio signals, etc.
• Associated buildings and structures within the boundaries, including the keeper's house, oil house, sheds, and cisterns.
• Alterations

WATER SUPPLY AND CONTROL SYSTEMS

• Dates of construction
• Construction materials li>Principal engineers
• Flood control systems
• Water distribution systems
• Filtration systems
• Settling tanks
• Associated buildings and structures (gatehouse, dams, pumping station, reservoirs, etc.)
• Purpose (public water, irrigation, flood control, etc.)
• Alterations

POWER DAMS

• Dates of construction
• Construction materials
• Principal engineers
• Levee dimensions
• Floodway dimensions
• Gates
• Channel dimensions
• Storage reservoirs
• Slope
• Size
• Grade
• Section
• Waterwheel type (overshot, for example)
• Penstocks
• Power generators
• Number of kilowatts
• Alterations

POWER GENERATING PLANTS

• Dates of construction
• Principal engineers
• Construction materials
• Source of power: coal-fired, steam, nuclear, hydroelectric, etc.
• Buildings and structures comprising facility
• Alterations

ELECTRICAL SYSTEMS

• Dates of construction
• Principal engineers
• Wiring (type, placement above or below ground)
• Substations
• Towers for power lines (dimensions, type, etc.)
• Light fixtures
• Transformer boxes
• Switches
• Alterations

  (See also Power Generating Plants)

HEAVY POWER MACHINERY

• Dates of construction
• Cylinder bore and stroke
• Horsepower
• R.P.M. (revolutions per minute)
• Pounds per square inch (of steam)
• Manufacturer
• Materials
• Type of valves and gear
• Type of crosshead guides
• Type of connecting rod ends
• Type of crank
• Method of drive (rope, direct, etc.)
• Flywheel diameter and face
• Type of condenser
• Uses of exhaust steam
• Changes to engine
• Boiler history, if known
• Earlier power sources on site
• Alterations

SANITARY SYSTEMS

• Dates of construction
• Principal engineers
• Construction materials
• Settling tanks
• Piping system
• Filtration systems
• Alterations

(See also Water Supply and Control Systems)

MINES AND OTHER EXTRACTION FACILITIES

• Dates of construction
• Construction materials
• Construction firm
• Principal mining engineers
• Mineral content
• Type of mine (open-pit, etc.)
• Mine dimensions
• Materials and types of conveyance systems (trams, railroads, etc.)
• Shafts, tunnels, pits, and other structures
• Tailings
• Alterations

MILLS, FACTORIES, AND OTHER PROCESSING FACILITIES

• Dates of construction
• Construction materials
• Principal engineers
• Power source (see Power Generating Plants and Heavy Power Machinery)
• Buildings and structures (dimensions, functions, construction materials, physical layout, etc.)
• Historic machinery and equipment
• Site transportation systems (railroad spurs, loading and shipping docks, etc.)
• Alterations