360 CROSS. 



23. William A. Rogers. To procure a metric standard 



of length $350 



1880. 24. Silas W. Holman. Viscosity of gases 250 



25. Wolcott Gibbs. Construction of dynamo-electric 



machine of a new plan 150 



26. Samuel P. Langley. Distribution of heat in difPrac- 



tion spectrum. (Additional to 13.) 300 



1882. 27. Edward C. Pickering. Stellar photography, with a 



view of obtaining a method of estimating the 



brightness of stars 500 



28. John Trow bridge. Thomson effect and allied sub- 

 jects 250 



1883. 29. John Trowbridge. Addition to last preceding 



appropriation 100 



30. Frank N. Cole. Experiments on Maxwell's theory 



of light 50 



1884. 31. Rumford Committee. For purchase of Rowland 



grating 40 



32. William H. Pickering. Experiments in photog- 



raphy 200 



33. John Trowbridge, Edward C. Pickering, Charles 



R. Cross. Experiments on standard of light . . 300 



34. Edward C. Pickering. Photometry. (Additional 



to 27.) ' 200 



35. William A. Rogers. Production of constant tem- 



peratures 100 



36. John Trowbridge. Effect of changes of tempera- 



ture on magnetism 100 



1885. 37. William A. Rogers. For Construction of constant 



temperature room. (Additional to 35.) ... 82 



38. Edward C. Pickering. Photometry. (Additional 



to 34.) ' 300 



39. William H. Pickering. Photography and new 



standard of light. (Additional to 32.) ... 300 



1886. 40. William H. Pickering. Observations of Solar 



Corona, Eclipse of August, 1886 500 



41. Henry P. Bowditch. Calorimetric observations on 



the heat of the human body. ($100, only, called 



for.) ' \ . . 500 



42. John Trowbridge. Standard of light. (Appropria- 



tion subsequently transferred to another research, 



viz., radiant energy, 44.) 250 



