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→Measurement techniques
==Measurement techniques==
==Measurement techniques==
[[file:rate-of-penetration_fig1.png|left|thumb|{{figure number|1}}Example of a geolograph chart.]]
[[file:rate-of-penetration_fig1.png|300px|thumb|{{figure number|1}}Example of a geolograph chart.]]
Rate of penetration is calculated by measuring the length of time required to drill [[length::1 ft]] of depth. This is typically done by reading the chart on the geolograph.
Rate of penetration is calculated by measuring the length of time required to drill [[length::1 ft]] of depth. This is typically done by reading the chart on the geolograph.