PROGRAM DOCUMENTATION 

     Software is located in the software directory. Interested users can go to this
     directory and download the necessary software.
 
MAIN PROGRAM NAME: cvort 

PURPOSE: To compute Centrifugal Velocity OR Times for settling specific particles
         from a given medium.

PROGRAM SYNOPSIS: cvort [-mtpv]

SOURCE LANGUAGE: This version of the program was written in "c" 

COMPILING: The program can be compiled to run under UNIX.
           Type the command "cc cvort.c -lm"
           The output executable "a.out" should be renamed cvort

DESCRIPTION: The user may compute the total running time and T - td (time to
             start deceleration) for a given particle to be completely settled
             from a given medium.

             When no options are specified, it is assumed that the medium is
             water at 20 degrees Centigrade and the particle is quartz
             (sp = 2.65 gm/cc).
             
             OPTIONS:

                -t -- The 't' option on the run-line causes a querie for a
                      temperature between 16-40 degrees Centigrade.  The
                      viscosity and specific gravity of water at that
                      temperature is selected from the program look-up table.
                      It is not necessary to know the temperature of any other
                      medium or water outside the look-up table range since
                      those medium must be described by specifying the 'm'
                      option on the run-line.

                -m -- The 'm' option will cause the program to prompt the user
                      for a viscosity (poise) and a specific gravity (g/cc)
                      of the medium.

                -p -- The 'p' option is used when the particulate to be settled
                      is not quartz.

                -v -- The 'v' option will assume the user has a specific total
                      time (with appropriate acceleration time and deceleration
                      time) and would like to compute a velocity to affect the
                      separation.

             The radius of the finest particle to be settled must be entered in
             micro-meters.  The user is then prompted for the initial and final
             distance from the center of rotation. (Units are inconsequential as
             the values are used as a ratio.)

             When the user is computing the velocity, a total running time
             (in seconds)  must be entered.  Otherwise, the velocity in
             revolutions/minute will be requested and the total time and (T - Td)
             will be computed.

             The user must also enter the time of acceleration and the time of
             deceleration (in seconds).

FILES: cvort.h - 'include' header that contains an array of look-up table values needed
                 by the program
       cvort.c - program source code
       cvortdoc.txt - text version of the software documentation
       cvortdoc.doc - Microsoft Word version of the software documentation
       cvortdoc.htm - HTM version of the software documentation

SEE ALSO: software/readme.txt

DIAGNOSTICS-BUGS: None known

AUTHOR/MAINTENANCE: Janet J. Fredericks, Woods Hole Oceanographic Institute, Woods Hole, MA 02543
                    Lawrence J. Poppe, U. S. Geological Survey, Woods Hole, MA 02543