flatbottom การใช้

This class of sailing vessel was designed as an economical, flatbottom, three masted schooner; its operation required only a small crew.
The 1940s 75 lb flatbottom rail placed on light weight concrete sleepers would be taken out and replaced with 1st generation steel sleepers bedded in ash ballast.
The only title that broke the pattern was his final creation, " J . C . Flatbottom ", which may have had an autobiographical character.
Three of which, used in the first generation ( " flatbottom " ), second generation, and third generation ( this style is still used today for Cooper luminaires ), were manufactured by Holophane, the other design, used for the second generation Silverliner, was manufactured by Corning Glass ."