157 



Solar Diagonal Eyepiece. See Eyepiece, Diagonal. [2, 3, 17, 18, 



21, 24, 25, 26, 27.] 



Solar Intensity Apparatus. An instrument invented by Padre 

 Secchi for measuring the comparative heat of the sun's rays. 



Solar Microscope. See Microscope. [26.] 



Solar Radiation Register. An apparatus to register automatically 

 the period of sunshine. [21.] 



Solar Telegraph. A telegraph in which the rays of the sun are 

 projected from and upon mirrors. [15.] 



Solenoid. A coil of wire the length of which is usually greater 

 than the diameter ; wound as cotton is on a reel. When an 

 electric current passes through the wire, the solenoid 

 possesses many of the properties of a magnet. [16.] 



Solid Glass Thermometer. See Thermometer. [4, 5, 13, 17.] 



Sondograph. A recording sounding apparatus to give a con- 

 tinuous delineation of the bottom of the sea. [16.] 



Sonometer. An, instrument consisting essentially of strings or 

 wires stretched on a sounding board, with arrangements for 

 varying the length vibrating and the tension for deter- 

 mining the number of vibrations made by a string emitting 

 a musical sound. 



Sounder, Flying. A name applied to any deep sea sounding 

 apparatus with which soundings can be taken without 

 stopping the ship. [13, 15, 16, 17, 28.] 



Sounding Apparatus, Brookes's. A form of deep sea sounding 

 apparatus invented by Lieut. Brooke, its special feature 

 being the automatic release of the plummet or weight on 

 striking the bottom. [13, 15.] 



Sounding-Lead. The plummet at the end of a sounding line. 

 [13, 15, 16, 17, 24, 28] 



Sounding-Line. The line which holds the sounding lead. [2, 

 13, 15, 16, 17, 21, 24, 28] 



Sounding Machine, Hand-Driven. Apparatus for ascertaining 

 the vertical depth at sea and for taking continuous soundings. 



Sounding Machine, Motor-Driven. [15.] 



Sounding Machine, Sceptre. An apparatus for navigational 

 sounding. [13, 28.] 



Sounding-Rod. A graduated iron rod used for ascertaining the 

 depth of water in the well on board ship. [13, 15, 21] 



Sounding-Thermometer. See Thermometer. [13, 15, 21, 24.] 



Sounding Tubes, Chemical. [15] 



Soxhlet's Apparatus. For milk analysis. [17, 21.] 



Soxhlet's Autoclave. See Autoclave. [2, 26.] 



Specific Gravity Bottle. A small glass bottle with a tubulured 

 stopper, used in the determination of the specific gravities 

 of liquids. [17, 21] 



Spectacles. A pair of lenses in a frame used to assist or correct 

 defects of vision. [2, 9, 13, 15, 17, 20, 26.] 



Spectacles, Franklin. Bifocal spectacles with two lenses of 

 different power in each eye. [2, 9, 15, 20, 21.] 



