S P H 



JResult of Mr Goldingham's elaborate series of experiments at Madrat. 



Mr Goldingham concludes, that for each degree of the thermometer 

 1.2 feet may be allowed in the velocity of sound for a second ; for each 



degree of the hygrometer 1.4 feet j and for th of an inch of the barome- 

 ter 9.2 feet. He concludes that 10 feet per second is the difference of the 

 velocity of sound between a calm and in a moderate breeze, and 21 feet 

 in a second, or 1275 in a minute, is the difference, when the wind is in the 

 direction of the motion of sound, or opposed to it. See Phil. Trans. 

 1823. 



SPECIFIC Gravity. See Gravity specific. 

 SPECTACLES.?e Eye. 

 SPHERE, doctrine of. 



In what is usually called the doctrine of the sphere is merely included 

 the solution of the following problem : 



In a spherical triangle, whose sides are the co-declination D, the co- 

 latitude of the place L, the zenith distance Z, and two of whose angles 

 are the hour angle from noon H, and azimuth , ; if any three of these 

 quantities be given, the other two may be found by the rules and formu- 

 lae of Trigonometry. 



For the solution of the several cases see Trigonometry spherical. 

 SPHERE, Equations to, when the axes are rectangular. (Hamilton.) 

 Let r radius, and suppose x', y', ' to be the coordinates of the cen- 

 2C9 P4, 



