XI 



LIST OF ILLUSTRATIONS 



FIG. PAGE 



163 Laryngoscope 260 



164 Land Chain 260 



165 Level, Spirit 261 



166 Level, Plain Reflecting ... 261 



167 Level, Abney 261 



1 68 Level, Abney, Micrometer 



Pattern 261 



169 Level, Surveyor's 262 



170 Levelling Staff 262 



171 Level, Surveyor's 262 



172 Log, Towing Pattern ... 263 



173 Log, The Cherub Rail 



Register 263 



174 Log, Excelsior, for Motor- 



boats 263 



175 Log, Bridge Connection ... 264 



176 Log, Bridge Indicator Dial 264 



177 Magnetometer 265 



178 Magnifying Lenses, Hand 



and Pocket 266 



179 Map Measurer ... ... 267 



1 80 Morse Signalling Lamp and 



Tapper ... ... ... 267 



181 Mathematical Instruments 268 



182 Mathematical Instruments 268 



183 Megaphone ... ... 269 



184 Microscope, Bacteriological 270 



185 Microscope, Binocular ... 271 



1 86 Microscope, Metallurgical 272 



187 Microscope, Research ... 273 



1 88 Microscope, Standard ... 274 



189 Micromanometer, Chattock 



Tilting 275 



190 Microscope Nosepiece, Re- 



volving ... ... ... 275 



191 Micro-Spectroscope ... 276 



192 Micromanometer, Threlfall 276 



193 Micrometer, Bi-Filar ... 277 



194 Micrometer, Boys' Radio... 277 



195 Micrometer, Star Photo- 



graphic ... ... ... 278 



196 Micrometer Filar 278 



197 Microtome, Rocking ... 279 



198 Mining Compass, Luminous 



Scales 280 



199 Mining Dial 281 



200 Navigraph Instrument ... 281 



201 Omnimeter Theodolite ... 282 



202 Optical Bench, Lens Test- 



ing ... . ... 283 



203 Optical Bench . ... 283 



204 Ophthalmoscope . ... 284 



205 Ophthalmoscope . ... 284 



206 Optical Square . ... 284 



FIG. PAGE 



207 Parallel Ruler, Metal, 



Field's Rolling 285 



208 Parallel Ruler, Metal, 



Field's Pattern 285 



209 Parallel Ruler, Field's Pat- 



tern 285 



210 Parallel Ruler 285 



211 XY Rolling (Field's) Paral- 



lel Rule 285 



212 Pantograph ... ... 286 



213 Passometer... ... ... 286 



214 Pedometer... ... ... 286 



215 Optical Square 287 



216 Photometer Wedge ... 287 



217 Proportional Dividers ... 287 



218 Perimeter 288 



219 Photometer, Ritchie's ... 289 



220 Periscope, with Prism Bino- 



culars 289 



221 Periscope, Trench ... 289 



222 Planimeter 289 



223 Photometer Bench ... 290 



224 Photometer, Nutting's ... 290 



225 Polarimeter ... ... 291 



226 Protractor ... ... ... 291 



227 Protractor ... ... ... 291 



228 Picket Poles 292 



229 Pitchometer 292 



A. The Instrument. 



B. As Applied on Ship. 



C. As Applied in Shop. 



230 Plane Table 293 



231 Pyrometer, F6ry Radiation 293 



232 Rain Gauge, Metallurgical, 



Office Pattern 294 



233 Rain Gauge, Tilting Bucket 294 



234 Range-Finder, Navigational 295 



235 Range-Finder, Naval ... 295 



236 Range-Finder, Infantry ... 296 



237 Range-Finder, Anti- Aircraft 296 



238 Refractometer, Pulfrich ... 297 



239 Sea Wave Counter ... 298 



240 Slide-Rule, Calculating 



Circle 298 



241 Refractometer, Abb6 ... 299 



242 Sauver's Bridge (Microscope 



Object-holder) 299 



243 Semi-Circumferenter ... 299 



244 Saccharimeter 300 



245 Shutter, Photographic ... 300 



246 Spot Lens (Microscope) ... 300 



247 Salinometer 301 



248 Sea-Water Hydrometer, 



B.T. Pattern 301 



