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Silent Partner

How do ball machines throw balls?

All quality tennis ball machines presently available on the market use wheels to throw the ball. Normally there are two wheels that turn in opposite direction (thus the label "counter rotating wheels") and have a small space between them. The ball rolls down a chute and is squeezed by the counter rotating wheels which then eject it. The situation is not all that different from gravel being thrown from under a spinning tire, though in the case of the tire only one wheel is responsible for the "throwing".

How long does it take to string a racquet?

With a little experience an operator will string a racquet in 30 to 45 minutes.  By going at full speed very experienced professionals can string a racquet in as little as 12 minutes, but they seldom do so because the quality of the string job invariably suffers and because they are left gasping for air at the end of it.  Ironically, it is simple things that slow a beginner down.  Things, for example, like new strings that get tangled the moment they are taken out of the package (to avoid this, it is advisable to hold the coil in one hand and to use the other hand to unwind the full length of the string on the floor).  Initial uncertainty about a racquet's stringing pattern will also slow a beginner down. One area where experienced stringers  really shine compared to beginners is in weaving the crosses (see instructions below for the definition of  "cross" and "main" strings).  Weaving   is usually done by placing one hand over the string bed and the other below it.  The leading edge of the string being weaved is pinched between the middle finger of each hand and is pushed up and down in alternation across the mains.  Good operators make this process look so effortless that the string appears to glide magically across the mains.

What are the main attributes that distinguish different kinds of strings?

The material used in a string (for example "nylon" in the case of synthetic gut), the construction of the string (a solid core surrounded by a single wrap of thinner filaments in the case of synthetic gut), and the gauge, or thickness, of the string define the essential characteristics of a string.