Frank Swannell Diaries: Part I
ms0392b01v04e011.jpg
| Revision as of May 4, 2015, 10:52:46 AM created by 65.61.234.59 |
Revision as of Jun 4, 2015, 1:41:19 PM protected by Rbcm.admin |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
MEMORANDA. | MEMORANDA. | ||
| − | Base Computations. Corrections: 1. For | + | Base Computations. Corrections: |
| − | + | 1. For Standard | |
| − | + | 2. " Temperature | |
| − | + | 3. " Inclination | |
| − | + | 4. " sag | |
| + | 5. " Height above sea | ||
| − | 2 (. | + | (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 | ||
| + | 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. | ||
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.