Dig at least 4 feet deep and 4 feet wide. Use the shovel if you must remove dirt that is underneath the foundation and you can not remove it with the backhoe. Place the house jack in the area where the engineer indicated on the plan. In most cases you will need to put in at least two house jacks. Lift the house jack until the barn has been lifted to the indicated height on the plans. Place the piers onto the ground as indicated on the plans. Use the sledge hammer to hammer the pier into place. Place the concrete cap over the the foundation pier.
The use of the phon as a unit of loudness is an improvement over just quoting the level in decibels, but it is still not a measurement which is directly proportional to loudness. Using the rule of thumb for loudness, the sone scale was created to provide such a linear scale of loudness.
A pure tone audiometry test measures the softest, or least audible, sound that a person can hear. During the test, you will wear earphones and hear a range of sounds directed to one ear at a time. The loudness of sound is measured in decibels (dB). A whisper is about 20 dB, loud music ranges 80-120 dB, and a jet engine is about 180 dB. The tone of sound is measured in frequencies (Hz). Low bass tones range 50-60 Hz, high-pitched tones range 10,000 Hz or higher. Normal hearing range is 250-8,000 Hz at 25 dB or lower. A word recognition test (also called speech discrimination test) assesses a person's ability to understand speech from background noise.