The Osaka Iron Works Company in Innoshima, Hiroshima built Eastern Light as yard number 951. The USSB paid $2,408,625 for her, plus $23,035 for "Repairs and Equipment".[1] She was completed in September 1918. Her lengths were 429 ft (131 m) overall[2] and 415.0 ft (126.5 m) registered. Her beam was 55.5 ft (16.9 m), her depth was 34.6 ft (10.5 m),[3] and her draft was 27 ft 6+3⁄4 in (8.4 m). Her hull had Isherwood-type longitudinal framing. Her five holds had capacity for 574,349 cubic feet (16,264 m3) of grain, or 524,918 cubic feet (14,864 m3) of baled cargo.[1] Her tonnages were 7,192 GRT, 5,477 NRT,[3] 10,500 DWT,[1] and 12,105 tons displacement.[2]
Eastern Light had a single screw, driven by a three-cylinder triple-expansion engine. It was rated at 553 NHP[3] or 3,200 ihp, and gave her a speed of 10+1⁄2 knots (19 km/h). Her permanent bunkers had capacity for 390 tons of coal, and her reserve bunkers had capacity for 1,058 tons. Burning an estimated 60 tons of coal per day, this gave her a range of 1,612 nautical miles (2,985 km) on permanent bunkers, and 6,047 nautical miles (11,199 km) on total bunkers.[1] The USSB registered Eastern Light in Seattle. Her US official number was 217292 and her code letters were LPBH.[3]
Osaka Iron Works built four sister ships for the USSB to the same EFC Design 1127. Eastern Knight and Eastern Mariner were completed in 1919, followed by Eastern Admiral and Eastern Sailor in 1920.[4]
Eastern Light returned to the USA ballasted with sand. She called en route at Plymouth, England, and reached New York on 10 April, after a crossing of 16 days. On 16 April the Navy decommissioned her and returned her to the USSB.[2]
Willkeno
In November 1926 the American Merchant Marine Steam Ship Corporation announced that it would buy Eastern Light, Eastern Admiral, and Eastern Mariner for $175,000 each. It intended each ship to carry cargoes of 5,000,000 ft (1,500,000 m) of lumber. And it intended to convert each ship from coal to oil fuel. They were renamed Willkeno, Willboro, and Willzipo respectively, as the company was in joint liability with the Williams Steam Ship Corporation.[1] The three ships were registered in Wilmington, Delaware.[5]
In 1928 the Williams SS Corp absorbed the American Merchant Marine SS Corp,[1] and registered the ships in New York.[6] By 1934 Willkeno's wireless telegraphcall sign was WKII, and this had replaced her code letters.[7]
Isthmian and Illinoian
In 1937 the American-Hawaiian Steamship Company acquired Willkeno, Willboro, and Willzipo and renamed them Isthmian, Coloradan, and Washingtonian respectively.[8][9] Also by 1937, Isthmian's navigation equipment included wireless direction finding.[10] In December 1937 the American–Hawaiian SS Co announced that it was laying up three ships including Isthmian, and was considering laying up two others.[11]
Lloyd's Register of Shipping(PDF). Vol. II.–Steamers and Motorships of 300 tons gross and over. London: Lloyd's Register of Shipping. 1934 – via Southampton City Council.
Lloyd's Register of Shipping(PDF). Vol. II.–Steamers and Motorships of 300 tons gross and over. London: Lloyd's Register of Shipping. 1937 – via Southampton City Council.
Lloyd's Register of Shipping(PDF). Vol. II.–Steamers and Motorships of 300 tons. Trawlers, Tugs, Dredgers, &c. Sailing Vessels. Shipowners, &c. London: Lloyd's Register of Shipping. 1939 – via Southampton City Council.