## Frank Swannell Diaries: Part I

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MEMORANDA. | MEMORANDA. | ||

− | Base Computations. Corrections: 1. For | + | Base Computations. Corrections: |

− | + | 1. For Standard | |

− | + | 2. " Temperature | |

− | + | 3. " Inclination | |

− | + | 4. " sag | |

+ | 5. " Height above sea | ||

− | (2) Steel expands 625/10,000000 (.00000625) of its length for | + | (2) Steel expands 625/10,000000 (.00000625) of its length for 1° Fahrn |

(4) Sag Let s = Correction for sag | (4) Sag Let s = Correction for sag | ||

− | + | l = length in feet between supports | |

− | + | w = weight of tape in lbs | |

− | + | t = tension applied in lbs | |

− | + | ||

− | + | ||

+ | s = l w2/2t2 approx | ||

(5) Reduction of Measurements To Mean Sea Level | (5) Reduction of Measurements To Mean Sea Level | ||

− | h = mean ht. ab. sea level | + | h = mean ht. ab. sea level |

+ | R = rad. Earth (20,900,000 ft) | ||

Corr = h/R x length of base | Corr = h/R x length of base | ||

− | Measured Length say 5301 | + | Measured Length say 5301 |

+ | Altitude 4520' | ||

Correction = -4520x5301/20,900,000 = -1.146' | Correction = -4520x5301/20,900,000 = -1.146' | ||

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Contour Intervals 50/Inches To Mile | Contour Intervals 50/Inches To Mile | ||

− | |||

Practical Astronomy | Practical Astronomy | ||

Parallax in attitude is the angular depression of a celestial body, in consequence of its being seen from the surface instead of center of the earth | Parallax in attitude is the angular depression of a celestial body, in consequence of its being seen from the surface instead of center of the earth | ||

− | + | ASC-LTSU -- Parallax in attitude | |

− | + | Always additive | |

When @ is on the horizon, depression or parallax greatest - "Horizontal Parallax" (of sun abt 9" | When @ is on the horizon, depression or parallax greatest - "Horizontal Parallax" (of sun abt 9" | ||

Astronomical Refraction 0 at Zenith 34' at Horizon | Astronomical Refraction 0 at Zenith 34' at Horizon | ||

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27th November 1914 - Pass Medical Examination & Enlist for Active Service Cop B. 88th Victoria Fusiliers | 27th November 1914 - Pass Medical Examination & Enlist for Active Service Cop B. 88th Victoria Fusiliers | ||

− | |||

− | BC Archives, MS-0392 | + | BC Archives, MS-0392 Box 1 Volume 4 / FRANK SWANNELL PAPERS / Diary and enclosures, 1915. |

− | + | ||

− | + |

## Revision as of Jun 4, 2015, 1:38:38 PM

MEMORANDA.

Base Computations. Corrections: 1. For Standard 2. " Temperature 3. " Inclination 4. " sag 5. " Height above sea

(2) Steel expands 625/10,000000 (.00000625) of its length for 1° Fahrn

(4) Sag Let s = Correction for sag l = length in feet between supports w = weight of tape in lbs t = tension applied in lbs

s = l w2/2t2 approx

(5) Reduction of Measurements To Mean Sea Level h = mean ht. ab. sea level R = rad. Earth (20,900,000 ft) Corr = h/R x length of base Measured Length say 5301 Altitude 4520' Correction = -4520x5301/20,900,000 = -1.146'

19:35, 17 May 2015 (PDT)19:35, 17 May 2015 (PDT)19:35, 17 May 2015 (PDT)65.61.234.59

Contour Intervals 50/Inches To Mile

Practical Astronomy

Parallax in attitude is the angular depression of a celestial body, in consequence of its being seen from the surface instead of center of the earth ASC-LTSU -- Parallax in attitude Always additive When @ is on the horizon, depression or parallax greatest - "Horizontal Parallax" (of sun abt 9" Astronomical Refraction 0 at Zenith 34' at Horizon

27th November 1914 - Pass Medical Examination & Enlist for Active Service Cop B. 88th Victoria Fusiliers

BC Archives, MS-0392 Box 1 Volume 4 / FRANK SWANNELL PAPERS / Diary and enclosures, 1915.