The Second GEODETIC LEVELLING of ENGLAND & WALES 1912-1921 Published, by Order of the Ministry of Agriculture and Fisheries, by Colonel Sir Charles Close, KBE, CB, CMG, FRS Director-General of the Ordnance Survey, Southampton 1921
[Companion volume to the '2GL Abstract' - Original Index]
Contents *
Introduction			4
I	(AJW)	History of the Ordnance Survey Levelling	7
II	(AJW)	Instruments	11
III	(AJW)	Methods of Observation	15
IV	(HLPJ)	Orthometric and Dynamic Corrections	19
V	(AJW)	Tidal Observations	24
VI	(HLPJ)	Mean Sea Level	30
VII	(HLPJ)	Effect of Meteorological Conditions on the level of the sea	35
VIII	(HLPJ)	The errors of levelling and the method of reduction	39
VIX	(HLPJ)	Reduction of the observations of the level net	55
PLATES (gallery)
I		Diagram of network of 1st Geodetic Levelling.
II		Diagram of network of 2nd Geodetic Levelling.
III		Diagram of difference of level of old and new levelling
IV		Diagram of Tidal Gauges, Liverpool
V		Zeiss Level
VI		Zeiss Level
VII		Geodetic Staves
VIII		Details of Geodetic Staves
IX		Graduation of Geodetic Staves
X		Fundamental Bench Mark
XI		Flush Bracket
XII		Dunbar Tidal Observatory
XIIa		Newlyn Tidal Observatory
XIII		Automatic Tide Gauge
XIV to XX		Sea Level Curves [not scanned ...]
XXI to XLII		Error Curves [not scanned ...]
XLIII to XLVI		Reduction Equations [not scanned ...]
* The initials are those of the writers of the respective chapters: AJW standing for Lieut.-Colonel A.J. Wolff, DSO, RE, and HLPJ for Mr H.L.P. Jolly, MA