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Section of 41 bromide prints

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

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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 aerial view shows the completed observatory with its dome shutters part open.

The Hooker Telescope Dome with shutter partly open, c1917

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 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 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 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 completed telescope mounting without the mirror in a vertical position inside the observatory dome.

The 100-inch Hooker Telescope, c. 1917

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 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 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 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
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 completed mirror being lift into position onto the support mechanism of the mirror cell.

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 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 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
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 1440 teeth being cut into the main driving worm wheel gear of the 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 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 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 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 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 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 taken from the 150-foot Solar Tower Telescope 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
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 from the east shows shutter opening on 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 completed mirror in it support cell ready to be lift into position on the 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 an engineering drawing of the lower section of the telescope tube showing the Declination Bearings, Mirror with Support Mechanism and 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
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 north pier of the telescope in position 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 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 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 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 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 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 the side members of the telescope's polar axis 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 top section of the main girder of the Dome being transported on the rough mountain road.

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 and the iron columns for the observatory building with 150-Solar Tower Telescope in the distance.

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 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 driving clock mechanism for the 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 lower section of the telescope tube on a lorry being transported 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 a section of the telescope's polar axis with hub for steel float in the engineering workshops of the fabricator.

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

1916-1918