Croll, James, 1821-1890 (physical geologist and Keeper of Maps and Correspondence, Geological Survey of Scotland)
Person
Found in 10 Collections and/or Records:
Letter to Sir Charles Lyell from James Croll, 4 January 1866
Item
Identifier: Coll-203/1 folio(s) 590-592
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the effect of the build up of ice during the glacial epoch upon the level of the ocean and his belief that the level of the ocean would not be lowered by the accumulation of ice as the level of the water would adjust itself to the altered centre of gravity of the earth, 4 January 1866.
Dates:
4 January 1866
Letter to Sir Charles Lyell from James Croll, 6 January 1866
Item
Identifier: Coll-203/1 folio(s) 593-594
Scope and Contents
Letter to Sir Charles Lyell from James Croll regarding modifications he has made to his Submergence Theory which held that the level of the ocean would not be lowered by the accumulation of ice due to Lyell passing on some calculations as to the amount of water needed from the oceans to form an ice-sheet of sufficient mass to alter the earth's centre of gravity. He encloses a letter to the Reader to put the matter straight and asks for Lyell's approval. 6 January 1866.
Dates:
6 January 1866
Letter to Sir Charles Lyell from James Croll, 8 January 1866
Item
Identifier: Coll-203/1 folio(s) 595
Scope and Contents
Letter to Sir Charles Lyell from James Croll regarding another alteration to his Submergence Theory which he explains in sheets which he encloses for Lyell to send to The Reader with his earlier letter (See Lyell 1/593-594). His alterations concern the structure of ice caps which have a solid crust covering and a liquid nucleus, 8 January 1866.
Dates:
8 January 1866
Letter to Sir Charles Lyell from James Croll, 8 February 1866
Item
Identifier: Coll-203/1 folio(s) 603-604
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the effect of ice-caps upon the level of the ocean and announcing the publication of an important paper by Rev. G Fisher on the subject, 8 February 1866.
Dates:
8 February 1866
Letter to Sir Charles Lyell from James Croll, 16 February 1866
Item
Identifier: Coll-203/1 folio(s) 605
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the extent to which the centre of gravity of the earth would be displaced by ice caps 2000 feet and 3000 feet thick, 16 February 1866.
Dates:
16 February 1866
Letter to Sir Charles Lyell from James Croll, 17 February 1866
Item
Identifier: Coll-203/1 folio(s) 606-607
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning calculations of Charles Moore's which Lyell had sent to him and discussing his own calculations which show how much the centre of gravity of the Earth would have been displaced by the weight of ice-caps, 17 February 1866.
Dates:
17 February 1866
Letter to Sir Charles Lyell from James Croll, 28 February 1866
Item
Identifier: Coll-203/1 folio(s) 608-609
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the calculations made by himself and Charles Moore as to the shift in the centre of gravity due to ice-caps and concerning Solstitial points and Perihelion in the earth's orbit, 28 February 1866.
Dates:
28 February 1866
Letter to Sir Charles Lyell from James Croll, 17 April 1866
Item
Identifier: Coll-203/1 folio(s) 611-612
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the quantity of heat received from the sun between two equinoxes, the effect of Perihelion and Aphelion on the length and strength of summers and winters and the effect of the formation of ice and snow on the levels of heat given off from the earth, 17 April 1866.
Dates:
17 April 1866
Letter to Sir Charles Lyell from James Croll, 23 April 1866
Item
Identifier: Coll-203/1 folio(s) 615-618
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning the temperature of the earth in both winter and summer and how this temperature is affected by the position of the earth in relation to the sun and snow and ice throughout the world, 23 April 1866.
Dates:
23 April 1866
Letter to Sir Charles Lyell from James Croll, 6 July 1866
Item
Identifier: Coll-203/1 folio(s) 620-621
Scope and Contents
Letter to Sir Charles Lyell from James Croll concerning his calculations of the thickness of the ice sheets and the extent of the submergence which he claims are based on geological grounds. He also discusses the possible extent of the submergence, the effect on the climate of the Ice sheet and his belief that the grinding down of rock can not be attributed to floating ice but to the extent of time that the rock was covered in ice. He also states that he feels confident that the submergence and...
Dates:
6 July 1866