xii 



LIST OF ILLUSTRATIONS^/. 



FIG. PAGE 



249 Searchlight 302 



250 Searchlight 302 



251 Sextant, Box ... ... 303 



252 Sextant, Nautical ... ... 303 



253 Sextant, Paget, Angle ... 304 



254 Sextant, Paget, Double ... 304 



255 Sextant Stand ... ... 305 



256 Slide- Rule 305 



257 Semaphore ... ... 306 



258 Sounding Machine, The 



Winch 306 



259 Sounding or Depth Gauges 307 



260 Sounding Machine and Load 307 



261 Spectacles ... ... ... 308 



262 Spectrograph, Quartz ... 309 



263 Spectro-Heliograph ... 310 



264 Spectrometer ... ... 311 



265 Spectroscope, Astronomical 312 



266 Spectroscope, Solar Pro- 



minence ... ... ... 312 



267 Spherometer ... ... 312 



268 Stage, Warm, for Micro- 



scope 313 



269 Stereoscope 313 



270 Star Globe, Paget ... ... 314 



271 Station Pointer, Admiralty 



Pattern 315 



272 Station Pointer, XY Pat- 



tern 315 



273 Station Keeper, Bell's ... 316 



274 Stewart's Distance-Finder 316 



275 Submarine Sentry Winch, 



Fairlead and Sinker ... 317 



276 Submarine Sentry, The 



Kite 317 



277 Sundial, Equatorial ... 318 



278 Sunshine Recorder ... 318 



279 Telescope, Officer of the 



Watch 319 



280 Telescope, Naval ... ... 319 



281 Telescope, Naval Signalling 319 



282 Telescope, Altazimuth ... 320 



283 Telescope, Equatorial ... 321 



284 Theodolette 322 



FIG. PAGE 



285 Theodolite, Transit, for 



General Surveying ... 323 



286 Theodolite, Micrometer ... 324 



287 Theodolite, Photo ... 325 



288 Theodolite, Recording ... 326 



289 Thermometer, Copper Case 327 



290 Thermometer Screen ... 327 



291 Thermograph ... ... 327 



292 Thermometer (Six's Maxi- 



mum and Minimum) ... 328 



293 Thermometer, Window ... 328 



294 Thermometer, Solar Ra- 



diation 328 



295 Thermometer, Clinical ... 328 



296 Thermometer (in Scottish 



pattern Frame) ... ... 329 



297 Thermometer (in Wooden 



Mount, ascending) ... 329 



298 Thermometer (in Wooden 



Mount, descending) ... 329 



299 Deep Sea Water-Bottle ... 329 



300 Thermometer, Reversing 



Frame ... ... ... 329 



301 Thermometer (Terrestrial 



Radiation) 330 



302 Thermometer (Terrestrial 



Radiation) 330 



303 Thermometer (Deep-Sea, 



Reversing Type) ... 330 



304 Thermometer (Deep-Sea, 



Reversing Type) ... 330 



305 Thermometer (Maximum 



and Minimum) ... ... 330 



306 Tide-Gauge, India Office 



Pattern 331 



307 Tide-Recorder, Field and 



Cust 331 



308 Transit Instrument ... 332 



309 Tape Measure ... ... 332 



310 Trial Sight Frame 333 



311 Trial Sight Case 333 



312 X-Ray Apparatus ... 334 



313 Valvograph 334 



