Frank Swannell Diaries: Part I
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| Revision as of May 17, 2015, 7:34:47 PM edited by 65.61.234.59 |
Revision as of Jun 4, 2015, 1:41:19 PM protected by Rbcm.admin |
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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 | ||
| − | + | 27th November 1914 - Pass Medical Examination & Enlist for Active Service Coy B. 88th Victoria Fusiliers | |
| − | 27th November 1914 - Pass Medical Examination & Enlist for Active Service | + | |
| − | + | ||
| − | 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, 1:41:19 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'
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 Coy B. 88th Victoria Fusiliers
BC Archives, MS-0392 Box 1 Volume 4 / FRANK SWANNELL PAPERS / Diary and enclosures, 1915.