SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



built, standardized, and sold at 

 cost to observers throughout the 

 world. Repaired at cost and 

 restandardized free when 

 damaged. 



5. Water- flow and water-stir stand- 



ard pyrheliometers invented and 

 used. The world's scale of solar 

 radiation measurements rests on 

 them. 2 



6. Pyranometer invented. Used daily 



on short-method solar-constant 

 observations. Used by Moore in 

 North Carolina and Chile. 

 Copies made and sold at cost 

 world-wide. 



7. Honeycomb pyranometer, or meli- 



keron, invented. Used by Ab- 

 bot and Aldrich on human body, 

 and by Sverdrup in polar re- 

 gions. Copies made and sold 

 at cost world-wide. 



8. Balloon recording pyrheliometer 



invented and used at high alti- 

 tudes. 



9. Two-mirror coelostat invented. 



10. Slide-rule extrapolator invented. 



Constantly used in long-method 

 solar observing. 



11. High-power lamp and other de- 



vices prepared by F. E. Fowle 

 for researches on deep infrared 

 spectrum. 



12. Highly sensitive radiometer in- 



vented for measuring energy 

 spectra of stars. 



13. A prism of nearly normal wave- 



length dispersion invented. 



14. The kampometer invented, a 

 highly sensitive instrument for 

 measuring radiation. 



IS- The periodometer invented, a me- 

 chanical instrument for discov- 

 ering pcricKiic changes in data. 



16. A multiple rotating-sector dia- 



Annals, vol. 3, pp. 47-52, 1913; vol. 7, 



p. 105, 1954. 

 Smithsonian Misc. Coll., vol. 95, No. 



23, 1937; vol. Ill, No. 14, 1949. 



Annals, vol. 3, pp. 52-72, 1913; vol. 7, 



pp. 99-101, 1954- 

 Smithsonian Misc. Coll., vol. 87, No. 



15. 1932; vol. no. No. II, 1948. 



Smithsonian Misc. Coll., vol. 66, No. 7, 



1916. 

 Annals, vol. 4, pp. 65-84, 1922; vol. 7, 



pp. 15-16, 21, 138, 1954. 



Smithsonian Misc. Coll., vol. 72, No. 



13, 1922. 

 Annals, vol. 4, pp. 41, 300, 1922; vol. 



5, pp. 43-45, 1932. 



Smithsonian Misc. Coll., vol. 65, No. 4, 



1915- 

 Annals, vol. 4, pp. 347-365, 1922. 

 Annals, vol. 2, pp. 22-23, 2II, 1908. 

 Annals, vol. 4, pp. 84-86, 1922. 



Annals, vol. 4, pp. 23-25, 274-287, 1922. 



Astrophys. Journ., vol. 69, pp. 293-311, 



1929. 

 Smithsonian Misc. Coll., vol. 104, No. 



14, 1945. 

 Astrophys. Journ., vol. 11, No. 2, pp. 



135-139. March 1900. 

 Smithsonian Misc. Coll., vol. 104, No. 



22, 1946; vol. 107, No. 19, 1948. 

 Smithsonian Misc. Coll., vol. 89, No. 3, 



1933- 



Smithsonian Misc. Coll., vol. 87, No. 4, 

 1932. 



Annals, vol. 5, p. 96, 1932. 



2 A. P.O. modified form of Angstrom pyrheliometer is used in daily observa- 

 tions. See .'Xnnals, vol. 6, pp. 50-55, 1942. 



