Aberration, spherical 223
Abrasives, action of 26
Accuracy of knife-edge test 17
Alarm clock drive 306
Allegheny Metal 63 64
Aluminizing 467
Aperture, effect on seeing 598
Aplanatic reflectors 401
Aplanatic reflectors, definition 401
Aspheric surfaces, testing 132
Astigmatism 40 70
Astigmatism in Hartmann test 111
Astigmatism in refractors 226
Atmosphere, currents in 586
Atmosphere, prime factor in observing 586
Atmosphere, Telescope and Observer 585
Binocular reflector 518
Black glass 113
Blackening brass 178 179
Boron carbide 114
Brass, red, yellow 194
Brass, to turn brown 207
Bubble test 35
Bubbles in pitch 37
Camera lenses, judging 564
Caps, eye-lens 177 179
Cassegrain with Springfield 375
Cassegrain, collimating 279
Cassegrain, secondary 271
Castings, brass 194
Celestial pole compensator 520
Cemented objectives 244
Cementing lenses 256
Centering of lenses 172 185 253
Centering spindle 255
Chronograph 460
Clock stroke 32
Clock, Shortt 442
Clock, sidereal 425
Clock, Synchronome 427
Coefficients of expansion 113
Cold pressing 45
Cold pressing, tapered 33
Collimation and adjustment 272
Coma 225
Computers wanted 537
Constipation, old Doc Everest's sure cure for 32
Contrast and illumination 602
Conventions used with O. G. work 516
Convex spheres, test for 269
Cost, refractor 194
Cross-hairs, spider or metal 458
Cross-hairs, to make 566
Deformation, tool 31
Dewing 546 567 576
Diagonals 126
Diagonals, to make 282
Diaphragms for refractors 208
Dictaphone drive 308
Diffraction 15 17 21 47 87 90 96 97 107 607 620
Diffraction rings, caused by flat 614
Diffraction rings, seldom seen 613
Diffraction rings, width and brightness 613
Dispersion, explanation of 221
Dispersion, irrationality of 238
Dog-biscuit 28
Doormat or grid 37
Doughnut mathematics 3
Drives, power needed 306
Drives, telescope 303
Eclipse photography 573
Edge correction 43
Edging disks 116
Ellison, F. O'B. and W.F.A. 477
Evaporation effect 29
Evaporation effect, process for mirrors 467
Evaporation effect, to reduce 45
Expansion coefficients 113
Eye, imperfections of 600
Eye, training the 603
Eye-lens caps 177
Eyepiece, inexpensive 187
Eyepiece, lenses 141
Eyepiece, specifications 180
Fan for telescope tube 611 619
Filters 114 119
Finder objective 184
Finders combined with prisms 517
Flats, diffraction from 614
Flats, making 75 240
Flats, Selby on 113
Focal length of lenses 154 189 191
Focus adjustment of camera 533
Focusing a star camera 545 564
Fork, molding and casting 361
Frequency control, McMath 312
Friction effect 30
Gage for calipers 168
Gage, dial 250
Glass, makers of 226
Glass, standards for 225 226
Glycerine 45 119
Hand-wound drives 326
Handle 33
Handle, centering 34
Handle, pitched on lenses 253
Hardness, pitch 38
Hartmann test 109
HCF 31 40
Heat from observer's body 518
Heliometer 452
High magnification 258
Hill 43
Horological literature 446
Image, rule for size of 215
Index of refraction explained 220
Indoor adjustment of an equatorial 275
Inside-and-outside test 510
Irrationality of dispersion 238
King test 269
Knife-edge test, accuracy of 17
Knife-edge, precision in reading 509
Knife-edge, reversing 509
Lacquering 207
Lap making, Ritchey's method 252
Lap, color for working 38
Laps, iron for 168
Latitude and planetary research 606
Lenses, focus and curve relationship 154
Lenses, to judge 564
Limitations of telescopic vision 579
Linkage of Peaucellier 217
Lunar driving rate 325
Machines, not so good 28
Magnifications for different work 582
McMath 316
McMath frequency control 312 319
Metal laps 55
Metal mirrors 62
Metal plate under tool 507
Meteor photography 544
Meteor photography, observation with R. F. T. 644
Meteor photography, research 523
Micrometer screws, unnecessary 18
Micrometers 447
Milk bottle technic 43
Mirror sticks to tool 506
| Molding and casting 349 361
Mountings for refractors 208
Mountings for refractors, rigidity in 514
Nineteen-inch reflector 376
Observatories 483
occultations 535
Off-axis paraboloid 78
Overhang stroke 32
Parabolizing, three ways 381
Paraboloid, off-axis 78
Parallelizing 116
Pattern making 339
Perforating a disk 116
Pinhole, light-source for 88
Pinhole, peculiarities of 75
Pinhole, size of 87 90
Pinhole, to make small 89
Pitch 26
Pitch lap for small lens work 171
Pitch, hardness 38
Pits, to detect 508
Planetary details and small exit pupil 641
Planetary research 585
Planetary research, refractor in 612
Planetary research, size telescope for 606
Plowing, tool 31 38
Polar axis, adjustment of 274
Polaroid 116
Pole compensator 520
Polish, test for 508
Precision in knife-edge reading 509
Precision in objectives and mirrors 216—219
Pressure in grinding 35
Prism, objective 546 568
Prism, silvered 517
Prism-finder rigs 517
Professional and amateur work 400
Pseudoscopic effect 519
Pumps, vacuum 476
Pupil, measuring diameter of 626 643
Quantitative Ronchi test 104
Rayleigh water test 121
Recording timer 539
Reflectors versus refractors 213 214 606 616
Refraction, effect of on driving 303 324
Refractive index explained 220
Refractors, reasons for superiority 614
Researches with our instruments 523
Richest-field telescope 623
Richest-field telescope for comet seeking 644
Richest-field telescope for meteor observation 644
Richest-field telescope, distinction between a and the R. F. T. 630
Richest-field telescope, summary of design principles 645
Ritchey — Chretien 401
Ritchey's lap making method 252
Ronchi test, quantitative 104
Rouge 114
Rouge, applying 40
Rouge, best mixture 38
Rouge, breaking lumps in 514
Rouge, making 514
Rouge, test 506
Rubber in laps 40
Runner 168
Sand, test for correct wetness 354
Schmidt camera in meteor photography 549
Schmidt camera, construction of 410
Scratches 40
Scratches and talcum 163
Scratches, avoiding while grinding 37
Seeing, and dewfall 607
Seeing, and haze 586
Seeing, scale of 593
Seeing, what it consists of 599
Selsyn motor drives 338
Semi-stroke 33
setting circles 287
shadows 22
Short telescope 402
Shorts 506
Shortt clock 442
Sidereal clock 425
Signs, rule of 156
Signs, used in O. G. work 516
Silvering 477
Silvering, back of prism 517
Sinking speed 38
Slit 19
Slit narrow 19 20
Slit, mechanism 503
Small lenses 141
Small tools 45 49
Sodium flame 516
Spectroscopy, stellar 568
Speculum metal 62 63
Sphere, convex in grinding 35 36
Sphere, convex, to cut in a lathe 245
Spherometer 242
Spider diffraction 620
Spindle, to make 150
Spit test 26
Spotting scopes 267
Spring drives 306 308 309
Springfield, air currents with 619
Springfield, Cassegrainian 375
Springfield, mounting 333
Star disks, appearance 515
Sticking mirror 506
Stops, taboo 21
Stroke for bowel exercise 32
Stroke for roughing out 34
Sub-diameter tools 43 45 118 120 121
Sun diagonal 258
Synchronome clock 427 463 466
Synchronous motor drives 312
Talcum for scratchy emery 163
Target scopes 262
Telescope for knife-edge shadows 259
Temperature, in telescopes 611
Test stars 605
Testing, convex spheres 269
Testing, equipment 18
Testing, routine 21
Testing, tunnel 19
Thermal effect 27
Time before testing 46
Tool, deformation 31
Tool, effect 27
Tool, plowing 31 34
Tool, thickness 508
Tool, using second-hand convex 35
Tool, warping of wooden 380
Tools, metal 55
Tube, currents in 610
Tube, larger than mirror 336 338 612 618
Tube, metal, gage for 368
Tube, open, closed 610 612
Tube, skeleton 616 617 619
Tube, square 616 617 618
Tube, wooden better than metal 612
Tungsten carbide 114
Turned-down edge 32 34 42 47 52 118
Turned-up edge 39
Under-and over-correction 224
Warping of wood on tool 507
Water drop test 506
Wooden tubes 616
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