As to why one uses pointers to pointers: 1  The name of an array usually yields the address of its first element. 2  Even though an array of strings sounds one-dimensional, it is in fact two-dimensional, since strings are character arrays. 3  A function f will need to accept an argument of type t ** if it is to alter a variable of type t *.
How to Use a Clinometer. A clinometer is used to measure angles. This is the method used by foresters to measure the height of a tree. The clinometer only works for measuring height when the observer is standing exactly one chain length away from the tree (66â or 100 links).
Once a tree's caliper exceeds 4 inches, the tree is measured at a height of 12 inches. All legitimate nurseries and garden centers in the United States use these specific standards to measure tree caliper.tandards for Measuring. Arborists in a landscape measure tree caliper at chest height to compare mature, established trees. This measurement is generally made 4 1/2 to 5 feet above the soil. In the nursery trade, caliper measurements are not arbitrary. National standards exist for exactly where a tree must be measured.