Method to designate the size of traveler

There may be a question from the Yarn manufacturing section or spinning section. Like

Define the method to designate the size of traveler with examples.

So I am going to answer this question as below:

Travelers are designated by a numerial or combination of numerals which are called their “size” or “number”. This system is based on the weight of 10 travelers. 

Ten number “1” travelers weight 10 grains. As the weight of ten travelers increases, the number is larger. The increase is not unifoem but average two grains per number. 

Commonly used numbers range from 1 upward to 50 as the weight of ten travelers less than 10 grains, the size is written with a number followed by a diagonal line and a zero. 

These are called “ought treavelers” or “naught traveler”. The size ranges 1/0 to around 25/0. These sizes decrease in weight in a varying range of staple of “1 grain per number, ½ a grain per number, and, finally ¼ of a grain per number, until the finest commonly used size weighs about 1 grain per ten travelers.

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