Gurley Manual of Surveying Instruments ...

adjusting socket axis Beam Compass Bow Pen Boxwood brass centre chain clamp and tangent clamp screw compass circle convex lens cross-wires declination arc described direction Drawing Pen edge engineer Engineer's Transit engraving equatorial lines eye-piece feet German Silver glass graduated half degrees hour inch needle inches diameter inches drawn inches shut instru jacob staff lengthening bar lens leveling instrument leveling screws limb line of collimation main socket ment micrometer Morocco moved needle point object object-glass observation optical axis ordinary Parallel Ruler pen and pencil pencil points pinion Plain Compass plain Dividers plumb-bob position precisely Price Protractor Railroad Compass revolve right angles ring Rosewood shown side sights solar apparatus Solar Compass spindle SPIRIT LEVELS steel sun's image surface Surveying surveyor Surveyor's Transit tangent movement tangent screw telescope Theodolite tion tripod head Troy true meridian tube variation Vernier Compass Vernier Transit wyes zero