FREE BOOKS

Author's List




PREV.   NEXT  
|<   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100  
>>  
had, finally, demonstrated the synthesis of hippuric acid and sulphate of phenol in the excided kidney as a function of its cells, by adding to the blood pouring through the kidney, in the first place, benzoic acid and glycol; in the second place, phenol and sulphate of soda. In order that these syntheses might make their appearance in the excided kidney, the presence of the blood corpuscles was not necessary, though, indeed, the presence of oxygen in the blood was indispensable. * * * * * VARYING CYLINDRICAL LENS. By TEMPEST ANDERSON, M.D., B. Sc. The author has had constructed a cylindrical lens in which the axis remains constant in direction and amount of refraction, while the refraction in the meridian at right angles to this varies continuously. A cone may be regarded as a succession of cylinders of different diameters graduating into one another by exceedingly small steps, so that if a short enough portion be considered, its curvature at any point may be regarded as cylindrical. A lens with one side plane and the other ground on a conical tool is therefore a concave cylindrical lens varying in concavity at different parts according to the diameter of the cone at the corresponding part. Two such lenses mounted with axes parallel and with curvatures varying in opposite directions produce a compound cylindrical lens, whose refraction in the direction of the axes is zero, and whose refraction in the meridian at right angles to this is at any point the sum of the refractions of the two lenses. This sum is nearly constant for a considerable distance along the axis so long as the same position of the lenses is maintained. If the lenses be slid one over the other in the direction of their axes, this sum changes, and we have a varying cylindrical lens. The lens is graduated by marking on the frame the relative position of the lenses when cylindrical lenses of known power are neutralized. Lenses were exhibited to the Royal Society, London, varying from to -6 DCy, and from to +6 DCy. * * * * * THE LAWS OF THE ABSORPTION OF LIGHT IN CRYSTALS. By H. BECQUEREL. 1. The absorption spectrum observed through a crystal varies with the direction of the rectilinear luminous vibration which propagates itself in this crystal. 2. The bands or rays observed through the same crystal have, in the spectrum, fixed positions, their intensity alo
PREV.   NEXT  
|<   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100  
>>  



Top keywords:

lenses

 

cylindrical

 

direction

 
varying
 
refraction
 

crystal

 
kidney
 

position

 

regarded

 

varies


angles
 

meridian

 

constant

 

spectrum

 

excided

 
sulphate
 

phenol

 

observed

 

presence

 
considerable

opposite

 
distance
 

parallel

 

directions

 

curvatures

 

compound

 

refractions

 
maintained
 

produce

 

luminous


vibration

 

propagates

 

rectilinear

 

absorption

 

BECQUEREL

 

positions

 

intensity

 

CRYSTALS

 

mounted

 

neutralized


marking

 

relative

 

Lenses

 

ABSORPTION

 

London

 

Society

 
exhibited
 

graduated

 

oxygen

 

appearance