Beranek, L.L. 1954. Acoustics. New York: McGraw-Hill.

Jerger, James, ed. 1963. Modern developments in audiology. New York:

Academic Press.

1. In audiometric screening, a rule of thumb is that if the threshold at 500, 1000 and 2000 Hz is no higher than 25 dB, no hearing impairment is assumed since many normal people show this condition. If the subject's thresholds are above 40 dB, he needs amplification to hear speech properly. Obviously, this test does not check rate of hearing loss.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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