We could not find a picture of the Hammonia but the image above is of her "sister" ship, the S.S. Borussia. As we understand it, these two ships would be identical.

 

Carl "Fred" Milhan
(1849-1950)

  

On April 23rd, 1873, Carl "Fred" Milhan boarded the ship, S.S. Hammonia at the port of Hamburg, Germany. He was the brother of Wilhelmina (Milhan) Rambow whose family would follow along with Fred's three younger siblings in 1874.

Fred made his way to Monroe, Michigan where he lived for a short while before moving into rural Raisinville Township where he built a log cabin. Within a few years, his sister, Wilhelmina, and her family, was living a short distance away on the same road.
 
SS Hammonia (1855)

Built as an early steamship, this iron-hulled vessel and her sister ship (the Borussia) marked the Hamburg-America Company's transition from sailing vessels to steam power. She featured three masts, a 360-hp engine, and could reach speeds of 12 knots. The hull measured 280 feet in length and 38.5 feet in beam with a gross tonnage of 2,026.

Hammomia began her regular New York to Hamburg route in 1856, making crossings in just 17 days. Chartered by Britain for troop transport during the Crimean War,  she was later sold and was wrecked in October of 1873.

This ship was designed to carry a mix of cabin passengers and emigrants, with accommodations for about 54 in first class, 146 in second class, and 310 in tweendeck steerage, plus a crew of 77.
 

S.S. most often refers to a Steamship. Occasionally, it was attached to a Ship Under Sail.