Through the 1840s, Neafie & Levy was primarily a manufacturer and supplier of marine steam engines and screw propellers to builders of wooden ships, such as
Birely, Hillman & Streaker and
William Cramp & Sons. In the early 1850s however, Neafie & Levy began to experiment with iron shipbuilding as a corollary to its propeller-making business. The screw propeller had a number of advantages over the
paddlewheel, but it also had disadvantages. Amongst these were the vibration levels caused by higher
RPM propeller engines, which loosened bolts on wooden ships, and the tendency for propeller shafts to break due to the phenomenon of "hogging" – the slight flexing of a ship's hull as waves pass beneath it. Since iron vessels were stronger and less prone to hogging, and were also less affected by vibration, it made sense to combine propeller technology with iron hulls. Neafie & Levy built its first iron ship in 1855. By 1860, it had become one of America's leading iron shipbuilding firms, with assets of $300,000, annual output of $368,000, and a workforce of 300. It had also become America's largest supplier of screw propellers, which grew to be so popular with the shipping firms on
North America's
Great Lakes that the company's curved propeller was dubbed the "Philadelphia wheel".
The Civil War The
American Civil War (1861–1865) was an economic boom period for American shipbuilders. Over the course of the war, the U.S. Navy requisitioned more than a million tons of shipping from commercial companies, and those companies were then obliged to return to the shipbuilding industry to replace the ships sold to the Navy. In addition, the Navy itself placed contracts with shipbuilders for the construction of warships and other tonnage, such as supply ships and troop transports, sparking a speculative boom in which private firms placed more shipping contracts in hopes of selling them to the government at inflated wartime prices. Neafie & Levy's experience with the Navy though, was to be less than agreeable. The company had supplied the engines for just prior to the war but the Navy Department was dissatisfied with the engine's performance and refused to make full payment, prompting Jacob Neafie to vow never to take another Navy contract. Apart from the construction of the experimental submarine in 1861, Neafie stuck to his vow and repudiated Navy contracts for the remainder of the war. His company still benefited from the boom in commercial shipping however, and made a substantial contribution to the war effort, supplying more than 120 engines for warships and other government vessels built at other yards. At its wartime peak, the company employed 800 workers.
Submarine Alligator In the autumn of 1861, the Navy asked Neafie and Levy to construct a small
submersible designed by the
French engineer
Brutus DeVilleroi, who was prepared to act as a supervisor during construction. The vessel was designed with a special airlock through which a diver could attach
mines to a ship's hull, and was intended for use against the
Confederate ironclad , for which the U.S. Navy had no defense. The contract with Neafie & Levy was signed in November 1861, and the submersible was expected to be completed within forty days, but difficulties with the design along with the departure of DeVilleroi delayed the ship's delivery by about six months, by which time the submersible's original purpose had been obviated. The Navy then attempted to use the submersible, now named
Alligator, for another mission off
Charleston, South Carolina, but while being towed there it sank during a storm on the night of 2 April 1863.
Alligator however, retains the distinction of being the first submarine to see service with the US Navy.
Postwar slump and recovery In 1865, the Civil War came to an end with the
Union victory, and the wartime conditions that had created a shipbuilding boom now gave way to a corresponding slump. The Navy conducted an auction of hundreds of unwanted ships, flooding the market and leaving shipyards with no work. Decline in the need for domestic shipping caused by the extension of railroads to the
South, along with the growing economic independence of the
West, also contributed to the shipbuilding
recession. The immediate response of Neafie & Levy, as at many other shipyards, was to slash its workforce to the bone. It then joined with William Cramp & Sons in 1866 to create a small subsidiary
ferryboat company, for the operation of which Cramp built a ferry called
Shackamaxon, while Neafie & Levy supplied the engines. The company's only other work in this period was for the production of a few towboats and some ship repair work. In 1867, Neafie & Levy suffered a major setback with the death of John P. Levy, whose management position was then filled by his heir Edmund L. Levy. With John Levy's death, the company appears to have lost much of its original dynamism, as Jacob Neafie's caution and conservatism increasingly became the dominant factor in its management. This decline would not become evident for some years however. By 1870 the slump had come to an end, and the years 1870–1871 were amongst Neafie & Levy's most productive. In this two-year period, Neafie & Levy was Philadelphia's busiest shipyard, building 27 vessels and supplying the engines for many others, including those for the 1,200-ton Cramp steamer
Clyde, built for the Clyde Line. ==Conservatism, 1870–1880s==