While working on a plane table, the correct rule is :

ANS:B - Draw short rays sufficient to contain the points sought

Draw short rays sufficient to contain the points sought. This rule suggests that when plotting points or features on a plane table, it's essential to draw short rays from the instrument station to the points of interest. These short rays should be long enough to encompass the area being surveyed or mapped. Drawing short rays helps maintain accuracy and clarity in the plotted map or survey. The other options mentioned may not necessarily be correct:

• Drawing continuous lines from all instrument stations might result in cluttered and confusing maps.
• Obtaining intersections by actually drawing second rays is not a common practice and can introduce errors.
• Taking the maximum number of sights from each station to distant objects may not always be necessary and can lead to unnecessary complexity in the mapping process.