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marine field for more than 60 years and is primarily concerned with the design, engineering, and construction of grain and coal barges, deck barges, liquid tank barges and cement barges for river and ocean service as well as dry- docks and towboats. With plants in Nashville and Ashland City, Tenn., Nashville Bridge Company is a major sup- plier of marine deck hardware to the entire marine industry. The company pioneered in the design and construction of much of the modern equipment used on rivers today. NATIONAL CRANE Write 46 on Reader Service Card National Crane's pedestal- mounted cranes are cost-efficient lifting systems for shipboard, dockside, and other marine uses. A wide selection of boom lengths and capacities are available from the 28-foot reach and 10,700-pound capabilities of the Marine 200 to the 75-foot length and 34,000- pound maximum capacity of the 800. A new addition to National's al- ready popular line of marine equipment is the 400, a medium- duty crane with lighter boom sec- tions and increased capacity. Each crane from the Waverly, Neb.-based company is built to rigid specifications and strict qual- ity control standards for years of profitable service in harsh marine environments. National Crane booms are built stronger and lighter with box-section construc- tion of high-strength, low alloy steel to handle heavy loads. The sequential extension of the tele- scoping boom sections interlock for strength and long reach, up to 75 feet. All cranes are fully marine conditioned by a process that in- cludes sand blasting of all exter- nal surfaces, an inorganic zinc primer coat, followed by paint and covered with a durable chlorinated rubber topcoat. National turret drives are specifically engineered for fast, smooth controlled slewing and minimum maintenance. Four models of telescoping ma- rine cranes are available to job- match the best crane for particu- lar lifting needs. The Marine 200 is an inexpen- sive, shorter radius machine for use on smaller boats and barges, in general purpose dockside and terminal work, and on offshore platforms. The 200 is ideally suited for many jobs where larger capac- ity cranes prove inefficient, while still providing the workhorse ca- pabilities of a reach up to 28 feet and maximum capacity of 10,700 pounds. The National 400 and 600 series provide increased reach and capac- ity for bigger jobs with maximum reaches of 55- and 56-feet, and load capacities of 16,000 and 25,000 pounds, respectively. National's 800 series offers some uniqueness in marine applications Write 604 on Reader Service Card because of its four-section hy- draulic extension capabilities up to 75 feet and 34,000-pound capac- ity. Heavy-duty construction and tough planetary drive rotation mean more work-time and less down-time, even under extreme duty. NATIONAL SUPPLY COMPANY Write 47 on Reader Service Card A cargo-handling barge has been designed to accept a National Sup- ply Company continuous lift jack- ing system which enables opera- tors to readily convert the barge into a stable platform for loading and unloading. The barge uses a rack-and- pinion jacking system originally developed by National for offshore drilling rigs and production plat- forms, said Bruce Dawson, engi- neer for National's marine equipment. With the "legs" jacked up, the barge retains its mobility and can be easily transported between shipyards. Once in location, the barge can be jacked up to create a stable platform at various dock levels. Mr. Dawson said the jacking system has a "smooth continuous lifting movement." The system uses an arrangement of horizontally opposed pairs of pinions which (continued from page 44) Make Loading /Unloading Easier, Faster, Safer With HIAB Hydraulic Deck Cranes Specially Developed For Marine Applications That's HIABility! HIAB's hydraulic sea cranes make work boats, research vessels, and other sea-going craft more productive and efficient. Controlled by one man, they provide up to 50% or more operational efficiency than davits or other cranes. That's HIABility! It adds up to superior work performance; reduced operational costs; and increased productivity. Superior design and a flexible elbow make HIAB cranes more maneuverable and precise. You can raise, lower, swing, extend and retract the boom for exact load spotting on or below deck or through narrow openings. The operator can see the hook, load and boom simultane- ously; this means faster cycles and greater personal protection. HIAB's foldup characteristic provides a low center of gravity, which makes for maximum stability. Specially constructed, HIAB cranes are highly resistant to sea and salt corrosion. See your HIAB distributor for information about these five new models. They carry a 6 month warranty. He'll show you how "HIABility" can reduce your material han- dling costs.
