Polariscope by Queen & Company
Camera and Nicol prism
Pickering wedge photometer
Harvard College Observatory wedge for Pickering ...
Mercury thermostat for Mills spectrograph
Tube for a Mercury thermostat, unmounted
Neon lamp
Sensitometer lamp bulb and box
Bunnell battery hydrometer in a cylindrical wood ...
Rheostat
Transformer
Moll galvanometer by Kipp
Moll galvanometer by Kipp
Moll galvanometer by Kipp & Zonen
Wheatstone resistance box by Elliott Brothers ...
Moll thermopile by Kipp
Induction coil
Inductance coil
Small parts and accessories for the Ross ...
Spider thread reticle for Ross Microphotometer ...
Reactance coil (?)
Reactance coil (?)
3-inch Clark lens, mounted ("Vulcan 8")
3-inch Clark lens, mounted ("Vulcan 5")
3-inch Clark lens, mounted ("Vulcan A")
3-inch Clark lens, mounted ("Vulcan 6")
3-inch Clark lens, mounted ("Vulcan F")
3-inch Clark lens, mounted ("Vulcan B")
3-inch Clark lens, mounted ("Vulcan 7")
3-inch Clark lens, mounted ("Vulcan H")
2.5-inch Petitdidier lens, mounted
2.5-inch Petitdidier lens, mounted
2-inch Petitdidier lens, mounted
Ultraviolet lens by Zeiss
2 1/8-inch Brashear triplet lens, mounted
5.4-cm Brashear triplet lens, mounted
1 1/2-inch Brashear lens for Keeler Star ...
1 1/2-inch Brashear lens for Keeler Star ...
1 1/2-inch Brashear lens for Keeler Star ...
2 1/8-inch Brashear triplet lens, mounted
Short-view photographic lens by Brashear, for ...
1 1/2-inch Brashear lens for Keeler Star ...
2 1/16-inch, 3-element lens, mounted
2-inch triplet lens, mounted
1.75-inch doublet lens, mounted
3.25-inch Brashear doublet lens, mounted
3.25-inch Brashear triplet lens, mounted
2-inch Gundlach lens, mounted
4.5-inch doublet lens, mounted
1-inch lens, mounted
2.5-inch Brashear correcting lens for 36-inch ...
2.1-inch Brashear triplet lens, mounted
Flat metal mirror by Carl Zeiss
4.25-inch Brashear lens, mounted
4.25-inch Brashear lens, mounted
Zeiss / Bausch and Lomb camera lens, mounted on ...
2-3/8 Steinheil lens
1 5/8-inch Zeiss / Bausch and Lomb camera lens
Condensing lens
Lantern lens
1 7/8-inch lens
1-inch Voigtlander lens with diaphragms
2-inch lens
Concave mirror (?)
Beck camera lens and Bausch and Lomb shutter
Old Willard Lens, mounted on aluminium camera box
Two 5-inch Brashear doublet lenses and their ...
5-inch McDowell doublet lenses (only C present)
1-inch, double-concave collimating lens
2 1/8-inch Brashear lens (missing), in a wooden ...
3-inch spectrograph camera
Voigtlander lens, in brass tube
Lens cell and cap for Crossley 36-inch reflector ...
3.5-inch lens
Brashear collimator lens
Stand for spectacle lens
2 1/8-inch lens, mounted (eyepiece?)
Double slide carrier
Quarter-inch and half-inch standards of length ...
Divided head (circular scale)
Zeiss comparator in wooden case
Leitz comparison ocular, eyepieces, and ...
Micrometer from Stackpole measuring engine (?)
Bureau of Standards 50-micron glass scale in a ...
Burreau of Standards glass scales (2)
Microscope objective for measuring engine (?)
Toepfer microscope
Gaertner measuring machine
Spherometer caliper
Glass reticle in a pasteboard box
Fused quartz rods, taped to a piece of wood
Five-position filter holder/slide for Crossley ...
Prosch Duplex shutter
Slit for making cylindrical enlargements (?)
Camera bellows with ground glass screen
Double-sided plate holder
Shutter by A. Laverne
2.5-inch Wratten filter
W. H. Wright's planetary enlarging camera for ...
Bubble level
Surveyor's transit by Bamberg
Bubble level tubes (2)
Bubble level
Mercury artificial horizon in wooden box
Bubble level
Bubble level
Bubble level
Bubble level
Long-view Telescope of Keeler Star Spectroscope
Direct vision star spectroscope for 12-inch ...
Compound prism, mounted
Ultraviolet glass prism
Crown(?) prism
Compound prism and mounting
Right-angle flint prism
Dense flint prism I
Dense flint prism II
Dense flint prism III
Ultraviolet glass prism
Round-faced prism
Flint-glass prism
Round-faced prism
Rowland concave grating
Rowland plane grating used with Keeler Star ...
Rowland plane grating in wooden box
Grating holder for small Rowland grating
Rowland plane grating in wooden box
Grating holder for Rowland grating
Parts of a slit mechanism
Michelson plane grating in wooden box; grating ...
Light flint prism
Light flint prism
Original Mills Spectrograph (parts)
Short view telescope for Keeler Star Spectroscope
Guide telescope
Fresnel rhomb prism
Frame for fluid prism
Double-refracting prism for polarizing photometer
Double-refracting prism for polarizing photometer
Replica Rowland plane grating in box
Spark holders (2)
Prism with silvered back, in aluminum housing
Reversing prism and mount
Guide telescope
Prism, mounted, and empty prism mount (parts of ...
Glass cube made of two cemented prisms, with ...
Glass cube made of two cemented prisms, with ...
Slit-viewing telescope
Double slit, mounted with tube
Slit and decker, mounted
Slit, mounted with tube
Curved slit, mounted with tube
Curved slit, mounted; straight slit jaws ...
Stellite slit jaws in a pasteboard box
Slit jaws in two pasteboard boxes
Platinum wire for Mercury thermostat
Piece of pure tin in a pasteboard box
Brass prism box and three prisms
Single-prism box from old Bruce Spectrograph ...
Lamp and rheostat, mounted
Slitless quartz spectrograph (Palmer spectrograph)
Slitless quartz spectrograph
Curved slit jaws, unmounted, in pasteboard box
Flint-glass prism
Prism, mounted
Ring micrometer for 12-inch refractor
Transit of Venus Accessory
Gauge for setting wheels of live-ring, 36-inch ...
Glass reticles for Grubb duplex micrometer
Duplex micrometer by Grubb
Driving clock and case
Driving clock and case
Driving clock
Polarizing solar eyepiece by Fauth and Co.
Planetary enlarging camera
Stage with coarse screw and and micrometer
Part of Crossley enlarging attachment
Small telescope
Declination vernier of 36-inch refractor
Arrangement for measuring star transits with the ...
Double-slide guiding mechanism
Draw tube adaptor for 12-inch refractor
Glass reticle for meridian circle, in wooden box
Rod of pure Titanium, in wooden box
2-inch Brashear lens
1 3/4-inch lens belonging to Keeler
1 3/4-inch lens belonging to Keeler
Cummings photoelectric photometer for 12-inch ...
Coblentz thermocouple
Quartz prism double-star micrometer by Warner ...
Blue corrector for 36-inch spectrograph
Driving-clock governor for 12-inch refractor
Driving-clock movement for 12-inch refractor
Compound lens in brass mount with focusing ...
Compound lens in brass mount with focusing ...
Photographic plate holders and plate-holder box
Chemicals, metals, and test papers in vials ...
Wind direction meter from 36-inch refractor dome
Mercury thermal switch, mounted
Mercury thermal switch, mounted
Mercury thermal switch, mounted
Mercury thermal switch, unmounted
Rheostat
Rheostat
Rheostat
G-M Laboratories meter
Photographic plate holders (8) in carrying box
Recording hygrometer
Eyepiece with rack and pinion focuser
Micrometer eyepiece?
Micrometer eyepiece
Eyepiece (?)
Eyepiece with aperture wheel
Eyepiece tube
Polarizing eyepiece
Eyepiece
Compound eyepiece with added cross hairs
Eyepiece
Compound eyepiece by Browning of London
Plate-holder box and plate holders
Plate-drying rack
Kron-Whitford photoelectric photometer
Hollow cathode tube (?)
Photomultiplier tube
1P21 photomultiplier tube
Vidissector image dissector tube
Image tube in housing for Varo Mark III
Texas Instruments 500x500 CCD, packaged
Texas Instruments 800x800 CCD, packaged
E. G. & G. Reticon 400 x 1200 CCD, packaged
Ford Aerospace 2048 x 2048 CCD, packaged
NICMOS 256 x 256 infrared array
Uncut silicon wafer with eight CCD's
CCD dewar (#13) with 2048 x 2048 CCD, used with ...
Photocell
Photocell
Recording barometer