- Letter from Alden H. Emery, Executive Secretary, to Henry M. Woodburn, University of Buffalo. RE: Pleased that he will represent the ACS at the University of Toronto ceremonies. [Filed under LP Science: American Chemical Society: Correspondence, 1949-1950: Box #14.005 Folder #5.2]
- Letter from Alice A. Adanalian, Head, Div. of Specialized Personnel, Institute of International Education, to LP RE: States that Dr. Camille Sandorfy will not be coming to Cal Tech because he was unable to obtain an extension of his passport, and has formally withdrawn from his fellowship. [Letter from Executive Secretary to LP to Miss Alice A. Adanalian March 9, 1949, note from Dr. Camille Sandorfy to LP January 3, 1950] [Filed under LP Correspondence: #357.2]
- Letter from Dr. Paul Bartlett to LP RE: Informs him that S6 could be obtained by working in the dark and absence of oxygen. Reports that unfortunately the student working on this project has completed his degree and left. [Letter from LP to Bartlett10-14-49] [Filed under LP Correspondence: Box #23.9, file:(Bartlett, Paul D., 1939, 1944, 1949, 1963)]
- Letter from LP to Alden H. Emery, Executive Secretary. RE: Informs him that he is willing to replace Newman with Sparks. [Filed under LP Science: American Chemical Society: Correspondence, 1949-1950: Box #14.005 Folder #5.2]
- Letter from LP to Charles Coryell RE: Thanks him for the press stories from Atlantic City and about names of the elements wolfram and niobium. [Letters from Coryell to LP September 29, 1949, October 13, 1949] [Filed under LP Correspondence: Box #68.2, file:(Coryell, Charles D., 1928, 1936-1941, 1945, 1948-1950, 1954, 1956-1958, 1960-1963, 1968-1970)]
- Letter from LP to Dr. J. D. Bernal, Birkbeck College, cc: Dr. David P. Shoemaker, RE: Discusses the results of photograph and crystal analyzations of eta-bronze. States the results differed from Bernal's, and requests more of the eta-bronze and epsilon-bronze crystals. [Filed under LP Correspondence: #363.3]
- Letter from LP to Dr. Otto Beeck, Shell Development Laboratories RE: Request he send Al Smith to Cal Tech to speak at a Wednesday Seminar on the crystal structure of crystalline adducts of urea and straight chain aliphatic hydrocarbons. [Letter from Beeck to LP October 11, 1949] [Filed under LP Correspondence: Box #37.16, file:(B: Correspondence 1949)]
- Letter from LP to Henry Allen Moe, Guggenheim Foundation. RE: Thanks him for the letters of introduction to people in Mexico City. Plans a trip to Mexico in December. Pleased about the plans for the Foundation. [Reply from Moe October 11, 1949] [Filed under LP Science: John Simon Guggenheim Memorial Foundation, 1946-1952: Box #14.014 Folder #14.4]
- Letter from LP to J.D. Bernal. [Letter from Bernal to LP February 15, 1950] [Filed under LP Correspondence: Box #27.14, file:(Bernal, J.D., 1940, 1948-1971, 1981)]
October 5, 1949
Dr. J. D. Bernal
Do you remember that over twenty years ago - or perhaps just about twenty years ago - you sent me crystals of eta-bronze and epsilon-bronze, in order that I might see whether Laue methods verified the units that you had found. I remember that I checked your units for eta-bronze, but I do not remember whether I checked your epsilon-bronze unit or not. In your note to Nature in 1928 you give the dimensions of the orthorhombic cell for epsilon-bronze, Cu3Sn, as a0 = 4.38 Å, b0 = 5.55 Å, and c0 = 38.1 Å, the last cell dimension being eight times that for the pseudo unit.
Recently we have been working on these crystals, and we have now succeeded in determining the structure of eta-bronze. However, the two crystals, from the specimen provided by you, that have been photographed so far both were found to have c0 = 47.2 Å, which is ten times the pseudo unit, rather than eight times. The structure that has been determined for these crystals correspondingly repeats after ten pseudo units along c.
We are not certain now as to whether a mistake was made in your original investigation, or whether eta-bronze occurs in two forms. I am writing to ask you if you could check up on your earlier work, perhaps remeasuring the earlier photographs, if you still have them at hand. Perhaps, if you still have some of the original crystals, you would be willing to mail them to us. As mentioned above, the work done so far has been with use of crystals that you sent me a long while ago.
When I say we in this letter, I mean principally Dr. David Shoemaker, whom you may have met. He was in England a year and a half ago - he spent his year as a Guggenheim Fellow principally in Copenhagen in Bohr’s institute.
For a while we thought that we knew the structure of epsilon-bronze, Cu6Sn5 also, but this work has bogged down, at any rate for the time being.
With best regards, I am
cc: Dr. Shoemaker
- Letter from LP to W.H. Freeman, W.H. Freeman and Co., RE: LP says that Henry Allen Moe of the Guggenheim Foundation has suggested that the Spanish translation of "College Chemistry" be published by the Fondo de Cultura Economica, in Mexico. [Filed under LP Manuscripts of Books, 1950b.1]
- Newspaper Clipping: “Chemistry's Legions”, Washington (D.C.) Pathfinder, October 5, 1949. [Filed under LP Scrapbooks, 1946-1950: Box #6.005, Folder 5.45]