Errata

page iv: 'krefft'->'Krefft'

page 7: 'ememy'->'enemy'

page 7: 'destory'->'destroy'

page 8: 'whirpool'->'whirlpool'

page 10: 'aud'->'and'

page 14: 'rcommended'->'recommended'

page 24: 'aginst'->'against'

page 34: 'throuh'->'through'

page 42: 'spead'->'speed'

page 42: 'envolopes'->'envelopes'

page 43: 'the the'->'the'

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

page 54: 'descovering'->'discovering'

page 60: 'quanties'->'quantities'

page 64: 'begining'->'beginning'

page 68: ','->'.'

page 85: 'horripulation'->'horripilation'

page 85: 'celebacy'->'celibacy'

page 96: 'descibed'->'described'

page 99: 'nothern'->'northern'

page 102: 'weeled'->'wheeled'

page 123: 'clectric'->'electric'