The first mention of the manufacture of glass fishing floats was in the production registry of Norway's Hadeland Glassverk in 1841, and use by local fishermen started around that same time.

In the Pacific, Japan’s fishing fleet started using glass floats around 1910, and glass had replaced older materials (e.g., wood and cork) by the 1940's.  Later, in the 1970's, glass started being replaced by plastic, aluminum and styrofoam in the making of fishing floats. 

In Japan, fishing floats are known as ukidama ('bouy balls") or bindami  (glass balls).  They were made using various colors of recycled glass, which resulted in their blue/green color.  Many of those glass fishing floats escaped their binds over time to begin circling the Pacific Ocean.  Starting in the warm, north-flowing  Kuriosho Current of the western Pacific, their path would take them into the clockwise-flowing North Pacific Gyre to travel through the Arctic and along the entire Pacific shores of North America, often straying onto beaches along the way.  This phenomenon even inspired the writing of books, such as "Beachcombing  for Japanese Floats" in 1967.  Author Amos L. Wood wrote poetically:

 

"For almost fifty years, Japan, our immediate neighbor across the Pacific to the west, has unknowingly been sending good-will messengers to our Pacific beaches in the form of lost fishing net floats. These runaways from her vast fishing industry still create as much mystery and enchantment as they did in 1918, when they first started to show up on the Oregon beaches."

 

Though the arrival of those "good-will messengers" has waned over time to become a rare event today, the tradition of finding glass floats on the Oregon coast goes on through the contribution of local glassblowers.  Granted, the Floats have become more decorative than functional, but we use the same tools and techniques as the glassblowers of the 1800’s to create hand-blown glass Floats.  And they still tend to capture the “mystery and enchantment” that Mr. Wood described in his book.