Link Bubble Sextant (octant) Model A-12 Handbook, destription - operation - use - adjustment (kopie)

Link Bubble Sextant (octant) Model A-12 Handbook, destription - operation - use - adjustment (kopie)Bevat 7 hoofdsecties: 1. introduction, 2. general description, 3. detailed description - housing, scale, vernier, enz. 4. operating instructions - general operations, median (average) sights, to change drums, enz. 5. dis-assembly - bubble assembly, marker, lens tube assembly enz. 6. Assembly - general, lens tube assembly, bubble assembly, enz. 7 adjustments - objective lens, bubble housing, marking pencil, enz. Geïllustreerd met tekeningen.