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.
The usual context is the measurement of sound intensity in the air at a listener's location. The basic units are watts/m2 or watts/cm2 . Decibels measure the ratio of a given intensity I to the threshold of hearing intensity , so that this threshold takes the value 0 decibels (0 dB).