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Film positive (9 7/8" x 7 3/4") nebula N.G.C. 5866

1923

Film positive (9 7/8" x 7 3/4") Nebula N.G.C. 4594

1923

Photograph film positive 16" x 20"

1917

Nebula in Cygnus

1910-07

Nebula in Cygnus; NGC 6960; RA

1910-07-04

Photograph film positive

1919

Glass Positive of Hubble’s Classification of ‘Nebulae’

1930

Film positive (7 3/4" x 9 7/8") Nebula N.G.C. 4565

1923

Region of star cluster Messier 11.

1905

Film positive (7 3/4" x 9 7/8") Nebula N.G.C. 5194/5.M51

1923

Transparency, 15"x12", Orion Nebula

1931

Glass positive:- spiral Nebula in Libra

1929

Glass positive:- Trifid Nebula in Sagittarius

1921

Glass positive:- Spiral Nebula in Leo

1929

Glass positive:- Spiral Nebula in Hydra

1929

Glass positive:- Spiral Nebula in Virgo

1929

Glass positive:- Nebula in Pegasus

1929

Sunspots, American, 12 August 1917.

1917

Film positive Nebula N.G.C. 3115

1923

Film positive 9 7/8 x 7 3/4) Nebula N.G.C. 7217

1923

Photograph film positive of portion of the moon

1921
Section of 41 bromide prints, mounted on 5 display boards (one broken in two) showing stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California

Section of 41 bromide prints

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view show an engineering drawing of a cross-section schematic elevation of the telescope from the west showing the Dome, Telescope and Piers.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows wooden shuttering and brackets to support the casting of the concrete pillar of the telescope mounting.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the site for the observatory, taken from the 150-foot Solar Tower Telescope.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the concrete pier for the telescope mounting.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the top section of the main girder of the Dome arriving at the Observatory.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the top section of the main girder of the Dome being raised into its final position from the moving Balcony floor.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows shows the top section of the main girder of the Dome being raised into its final position.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror at the early grinding stage in the optical workshop.

Grinding & polishing machine for the Hooker Telescope mirror, 1910-16

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror being polished and given its final figure in the optical workshop.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view looking south shows the observatory dome under erection.

Assembling the Hooker Telescope building, c. 1916

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the un-silvered mirror raised into the vertical for testing in the optical workshop.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows a middle section of the telescope tube arriving at the Observatory.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows an engineering drawing of the Mercury trough main bearing, worm wheel gear, quick-motion drive and driving clock.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This south-west view shows the completed observatory from ground level with the dome shutter part open.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This north-west view shows the concrete pier for the telescope mounting and the iron columns for the observatory building.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the stationary floor of the observatory building and the tracks, wheels and framework of the dome and balcony on the right.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the framework for the moving Balcony floor of the Dome.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror support cell for the telescope arriving at the Observatory on a lorry.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the lower section of the telescope tube on a lorry ready for transportation up the mountain.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the telescope's completed Polar Axis and the lower section of the tube being assembled in the observatory dome.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the steel brackets of the telescope's Polar Axis in a planing machine in the engineering works of the fabricator.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the upper steel float of the telescope's polar axis being tested with compressed air. The lower float is also shown in position in the Mercury Trough.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows a model of the telescope mounting.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This view shows the mirror cell with its upper section removed revealing the support mechanism and the water pipes for temperature regulation.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
Glass positive:- E.E. Barnard, Mount Wilson Observatory, 1911, November 19, 60-inch Reflector, equivalent focal length, 100ft

Glass positive:- E.E. Barnard

1911
One of 41 bromide prints related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope at Mount Wilson, California. This nort-west view shows wooden shuttering to support the casting of the concrete pillar of the telescope mounting.

Bromide print related to and showing various stages in the construction of the Hooker 100-inch reflecting telescope

1916-1918
Photograph film positive, 16" x 20", portion of the Moon, photographed with the 100-inch Hooker Telescope of the Mount Wilson Observatory, 1919 September 15, region near Copernicus; including Western end of Apennines, with Eratosthenes, size of image 15" x 19 3/16"

Photograph film positive

1919
Photograph film positive, 16" x 20" central part of the Great Nebula in Orion, photographed with the 100-inch Hooker Telescope of the Mount Wilson Observatory 1920, March 18, exposure 1 3/4 hours

Photograph film positive

1920