## Historical and technical survey |

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Page 233

In this figure the attenuation

attenuation

computed from a formula developed by Freehafer and Furry of the Radiation

Laboratory: ...

In this figure the attenuation

**constant**a (h) is expressed in terms of theattenuation

**constant**for zero duct height a(0). In Figure 1 the curve for 5 < 1 wascomputed from a formula developed by Freehafer and Furry of the Radiation

Laboratory: ...

Page 257

The attenuation

ducts below 8 = 1.2. Beyond this value the effect of the duct increases rapidly,

and when 5 = 1.7 the attenuation

and at ...

The attenuation

**constant**differs by less than 1 per cent from the standard forducts below 8 = 1.2. Beyond this value the effect of the duct increases rapidly,

and when 5 = 1.7 the attenuation

**constant**is 10 per cent different from standard,and at ...

Page 298

12.003 C 12.004 C ^—12.005 C 12.006 S -\— — 12.007 C 12.008 S 12.009

12.010 C 12.011 S 12.012 S 12.013 S 12.014 S 12.015 C 12.016 C 12.017 S "S<

12.018 R 12.019 C 12.020 C 12.021 The Dielectric

12.003 C 12.004 C ^—12.005 C 12.006 S -\— — 12.007 C 12.008 S 12.009

12.010 C 12.011 S 12.012 S 12.013 S 12.014 S 12.015 C 12.016 C 12.017 S "S<

12.018 R 12.019 C 12.020 C 12.021 The Dielectric

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