Errata

page iv: 'krefft'->'Krefft'

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page 7: 'ememy'->'enemy'

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page 7: 'destory'->'destroy'

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page 8: 'whirpool'->'whirlpool'

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page 10: 'aud'->'and'

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page 14: 'rcommended'->'recommended'

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page 24: 'aginst'->'against'

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page 34: 'throuh'->'through'

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page 42: 'spead'->'speed'

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page 42: 'envolopes'->'envelopes'

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page 43: 'the the'->'the'

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page 54: 'smoke-abosrbing'->'smoke-absorbing'

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page 54: 'descovering'->'discovering'

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page 60: 'quanties'->'quantities'

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page 64: 'begining'->'beginning'

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page 68: ','->'.'

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page 85: 'horripulation'->'horripilation'

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page 85: 'celebacy'->'celibacy'

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page 96: 'descibed'->'described'

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page 99: 'nothern'->'northern'

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page 102: 'weeled'->'wheeled'

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page 123: 'clectric'->'electric'