MOUNT WILSON DIFFRACTION GRATING
BRASS CYLINDER CONDUCTOR
ELLIOTT BROTHERS WATER CURRENT METER
ARAGO DISK
DOUBLE SCOPE ECCENTRIC THEODOLITE
ELECTRIC FLY aka "ELECTRIC WHIRL" with Bells
BABINET GONIOMETER
FRIEDRICH LUX GAS BALANCE
ACHROMATIC DUPLEX PRISM
LARGE GEISSLER TUBE ROTATOR
SEISMIC INSTRUMENT EARTHQUAKE DETECTOR
HENRY TROEMNER PORTABLE BUTTON BALANCE
TRANSIT THEODOLITE
AMPERE'S STAND or APPARATUS
THOMPSON'S TWO-COIL REFLECTING ASTATIC GALVANOMETER BY ELLIOTT BROS.
BERTHELEMY/LEPETIT THEODOLITE
PIXII Hair HYGROMETER of the Saussure Design
PRECISION SPHEROMETER
ABBADIE'S REFLECTING THEODOLITE
DEMONSTRATION ARCHIMEDES' SCREW
UPRIGHT ACTUAL ENGINE
GURLEY RAILROAD COMPASS
EXTRAORDINARY UNIVERSAL AUTOMATIC SPECTROSCOPE
UNIVERSAL TACHYMETER
CURRENT BALANCE/GALVANOMETER
NORRENBERG POLARISCOPE
AIR MILL/DOUBLE WINDMILL
LARGE DUBOSCQ FREESTANDING LIQUID PRISM
BIRDCAGE QUADRANT ELECTROMETER
REVOLVING WIRE FRAME by Daniel Davis Jr.
ACOUSTIC DOUBLE SIREN
WATCHMAKERS ROUNDING-UP TOOL
SPECTROSCOPE by KRUSS
EARLY 19th CENTURY CUTHBERTSON PATTERN ELECTROSTATIC PLATE FRICTION GENERATOR
DUAL BENCH MICROMETER
DUBOSCQ POLARIZATION PROJECTOR
AINSWORTH ASSAY BALANCE
EXTRAORDINARY, ONE-OF-A-KIND GURLEY TRIANGULATION THEODOLITE
VERY EARLY VAN HEURCK in MONOCULAR and WENHAM BINOCULAR CONFIGURATIONS
RARE EARLY FINEMAN NEPHOSCOPE by J. HICKS LONDON
GURLEY BURT TELESCOPIC SOLAR COMPASS
EARLY GURLEY TRANSIT
CRYSTAL GONIOMETER
ELECTROMAGNETICALLY-OPERATED WATER PUMP MODEL
BRUNNER UNIVERSAL ASTRONOMICAL TRANSIT INSTRUMENT
ALLUARD DEW POINT HYGROMETER after REGNAULT
AMSLER MECHANICAL INTEGRATOR
MECHANIZED HAIR PLANIMETER
PARALLEL RULER AND ARM PROTRACTOR
EXTRAORDINARY SOLAR COMPASS BY FAUTH & CO.
FOUCAULT-STYLE SOLAR HELIOSTAT
LARGE TANGENT/GALVANOMETER COMBINATION
BOULENGE CHRONOGRAPH
ENGLISH PATTERN THEODOLITE
DUBOSCQ REFRACTION DEVICE
LARGE GEISSLER TUBE with original stand
C.L. Berger & Sons TRANSIT
LARGE INDUCTION COIL with PLATINUM AND MERCURY INTERRUPTERS
REMARKABLE AUTOMATIC SOLAR SPECTROSCOPE
SULLIVAN GALVANOMETER
TUNING FORK, Electrically Driven
DAVIS CLOCKWORK ELECTROTOME
RARE YOUNG & SONS Y LEVEL
THOMSON WIRE LINE RHEOSTAT
FARADAY ROTATION DEVICE by MAX KOHL
PORTABLE RESISTANCE BRIDGE and TESTING GALVANOMETER
DEPREZ D-ARSONVAL GALVANOMETER
FUESS HELIOSTAT
UNIVERSAL HELMHOLTZ DOUBLE COIL TANGENT GALVANOMETER with MOVABLE DIAL
INCLINATION DIP CIRCLE COMPASS
EXTRAORDINARY AZIMUTH THEODOLITE by FAUTH
KOHLRAUSCH UNIVERSAL RHEOMETER by HARTMANN & BRAUN
RIBRIGHT CIRCUMFERENTOR
RARE EARLY SCIENTIFIC SELF-REGULATING ARC LAMP by DUBOSCQ
EARLY ELECTRODYNAMOMETER / WATTMETER
EXPLORATION THEODOLITE
FOUR-COIL SOLENOID RECIPROCATING ELECTRIC MOTOR
NORRENBERG STYLE POLARISCOPE
REMARKABLE RUHMKORFF ELECTRODYNAMOMETER with MIRROR READING TELESCOPE
MEYERSTEIN STYLE POLAR HELIOSTAT by PLOSSL
EQUINOCTIAL UNIVERSAL INCLINING SUNDIAL
PITKIN MANUAL RHEOSTAT
SILBERMANN HELIOSTAT
GURLEY VERNIER COMPASS
MAGNETOMETER
LANDMARK HIPP CHRONOSCOPE by PEYER & FAVARGER
GEODETIC DIP CIRCLE by John Dover, Kew Observatory Pattern
AUSTRIAN THEODOLITE
TRAVELER TRANSIT THEODOLITE
MIRROR-READING GALVANOMETER - ELECTRODYNAMOMETER
ALTERNATING CURRENT DEMONSTRATION APPARATUS
LARGE GOLDSCHMIDT TWO-CIRCLE REFLECTING GONIOMETER
A REMARKABLY COMPLETE CARL BAMBERG MAGNETOMETER
PLANE TABLE ALIDADE
RIEFLER PRESENTATION DRAFTING INSTRUMENT SET
RECIPROCATING ARMATURE ENGINE
HELMHOLTZ RESONATORS
ADJUSTABLE TUNING FORKS
DANIELL'S HYGROMETER
VOLAND & SONS PORTABLE BUTTON BALANCE
DEMONSTRATION GYROSCOPE
FRESNEL DOUBLE MIRROR INSTRUMENT
SAN FRANCISCO AIRPORT EXHIBIT
SGRAVESANDE PATTERN HELIOSTAT BY FORTIN
FAUCAULT INTERRUPTER
ELECTRIC TUNING FORK AND HELMHOLTZ RESONATOR
DANIELL'S TRAVELING HYGROMETER
ACHROMATIC LENS
DOUBLE AMICI PRISM
DEMONSTRATION PLANO CONVEX CYLINDRICAL LENS
ASTRONOMICAL SPECTROSCOPE
LARGE REVOLVING MOTOR/MAGNET Based on Dr. Page's Design
18 INCH BUFF & BERGER WYE LEVEL
METRONOME WITH MERCURY INTERRUPTERSS
RARE EARLY TRAVELER"S CUP-PEDESTAL ANEMOMETER
SIX INK PENS
STANLEY DRAFTING SET
ARCHITECT Y LEVEL by QUEEN & CO.
DELEZENNE’S CIRCLE
WHEATSTONE BRIDGE by J. CARPENTIER
BUFF & BUFF TRANSIT
THOMPSON'S TWO-COIL REFLECTING ASTATIC GALVANOMETER