638 



SCIENCE 



[Vol. LVI, No. 1457 



New tables and graphs for facilitating the com- 

 putations of spectral energy distribution ty 

 Planclc's formula: M. Eathekine Peehafeb, 

 Bureau of Standards. 



Graphical aids to the transformation of color 

 measurements from one system to another: Her- 

 bert E. Ives, Western Eleetric Company. 



A color match photometer for illuminants: 

 Herbert E. Ives, Western Electric Company. 



Comparative color measurements of illuminants 

 iy trichromatic and monochromatic analyses: 

 Herbert E. Ives, Western Electric Company. 



The colorimetry and photometry of daylight 

 and incandescent illuminants by the method of 

 rotatory dispersion: Irwin U. Priest, Bureau of 

 Standards, Munsell Color Company. 



A hemispherical photometric integrator : Frank 

 Benfoed, General Electric Oompanj'. 



Improvements in photometric equipment for 

 integrating spheres: A. H. Taylor, Laboratory of 

 Applied Science, Nela Research Laboratories. 



A variable aperture rotating sectored disc: 

 Herbert E. Ives, Western Electric Company. 



The registering microphotometer of the Mount 

 Wilson Observatory : Edison Pettit and Seth B. 

 Nicholson, Mt. Wilson Observatory. 



Color mixing and comparing apparatus: Her- 

 mann Kellnee, Bausch & Lomb. 



Disappearance of the filament in improved 

 forms of the disappearing-filament optical 

 pyrometer: C. 0. Pairchild and W. H. Hoover, 

 Bureau of Standards. 



The relation between the hiding-power and re- 

 flection coefficients of white pigments and paints: 

 A. H. Ppund, Johns Hopkins University. 



On the ratio of intrinsic brightness to illumina- 

 tion: James E. Ives, U. S. Public Health Service. 



Preliminary data on the color of daylight at 

 Washington: Irwin G. Priest, Bureau of Stand- 

 ards, Munsell Color Company. 



The shrinkage of photographic films during de- 

 velopment: H. L. Curtis, Bureau of Standards. 



A special sensitometer for the study of the 

 photographic reciprocity law : LoTD A. Jones, 

 Eastman Kodak Company Besearch Laboratory. 



An instrument (densitometer) for the measure- 

 ment of high photographic densities: Lotd A. 

 Jones, Research Laboratory, Eastman Kodak 

 Company. 



An adaptation of the thalofide cell to the meas- 

 urement of photographic densities: A. L. Schoen, 

 Research Laboratory, Eastman Kodak Company. 



On the relation between time and intensity in 

 photographic exposure: Loyd A. Jones and 

 Emory Huse, Research Laboratory, Eastman 

 Kodak Company. 



Preliminary note on the spectral energy sensi- 

 tivity of photographic materials: Loyd A. Jones 

 and A. L. Schoen, Research Laboratory, Eastman 

 Kodak Company. 



The f oUovping are titles of papers which were 

 on ithe supplementary program and whose 

 authors did not respond when the papers were 

 ca'Hed : 



The horopter, oyclophoria and apparent vertical 

 meridian (preliminary report) : Chaeles Sheard, 

 American Optical Company. 



Aspherical lens systems: L. Silbeestein, East- 

 man Kodak Company. 



The paper by Hermann Kellner entitled 

 . "Motion analyser" on the advance program 

 was not read. In place of it, Dr. Kellner com- 

 municated a paper on stereoscopic vision, ab- 

 stract of which has not been submitted. 



Dr. Frank Benford communicated informally 

 the substance of a paper on the plotting of 

 spectrophotometric data which he had present- 

 ed at the convention of the Illuminating Engi- 

 neering Society in September., 



4. Exhibit of Optical Instruments 



The following is a list of exhibitors, together 

 with their exthibits. 



1. Munsell Color Company 

 Munsell color tree. 



Atlas of the Munsell color system. 



Two enlarged atlas charts. 



Neutral value scale, chroma scales. 



Munsell daylight photometer. 



Munsell crayons. 



Munsell water colors. 



Color index. 



Disc spinning motor for use with Maxwell discs. 



2. Keuffel & EssER Company 

 Holophane Ughtmeter. 



Aerial sextant. 



Prismatic gunsight turret telescope. 



Expedition plane table. 



Engineer 's Y level. 



Engineer 's mountain and mining transit. 



Engineer's transit. 



Triangulation theodolite. 



Spy glass, U. S. Navy pattern. 



4-inch ship's telescope. 



Anti-aircraft telescope. 



Stadimeter. 



Color analyzer. 



3. Ordnance Department, TJ. S. Aemy 

 Instruments of the fire control systems of mobile 

 artillery, observation and laying. 



