SECT. 4] 



LIGHT 



437 



directly proportional to the irradiance input to the sample, the readings can 

 easily be converted into values of volume scattering functions at the specified 

 angle by calibrating the instrument. 



The instrument, shown in Fig. 18, was developed by Kozlyaninov (1957) and 

 called a spectro-hydro nephelometer. This instrument has two voltage-regulated 

 light sources (5 and 15) of which the former irradiates the contained sample 1, 

 the other irradiates a "milk" glass component (12, 13, 14, 17) by means of 



t-'I'I'l 'I'hpv" 



26 29 



<4- 



Fig. 18. Scattering meter developed by Kozlyaninov (1957) for contained samples. 



the knife-edge mirror, 8, and the mechanical attenuating arrangement, 16. The 

 scattered light is visually matched in the split field of the eye piece with the 

 radiance of the milk glass. The scattering angle is changed by rotating the lamp 

 assembly, 5, around the vertical axis marked 6. Data is obtained from 1° to 150° 

 and can be converted to values of the volume scattering functions by calibration 

 procedures. 



The instrument is equipped with six narrow band filters, 10, and is used as 

 well for a measurements by rotating the lamp assembly, 5, to the position 

 ^ = 0°. 



