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Objective lens (4-inch) of around 30 feet focal length with wooden case and marked

1930-1939

Circular glass mirror (4 1/2-inch)

1934

Circular glass mirror (5 1/2-inch)

1930-1939

Two enlarged photographs showing the David Dunlap 74-inch Reflecting Telescope built for the Toronto University Observatory at Richmond Hill by Sir Howard Grubb, Parsons & Company at its optical works at Newcastle-on Tyne, England.

Photographs showing the David Dunlap 74-inch Reflecting Telescope

1933

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia.

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory

1928

Two photograph mounted together of an 18inch Coelostat, made for the Canberra Observatory, New South Wales by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Two photograph mounted together of an 18inch Coelostat

1921-1931

One of two enlarged photographs showing the David Dunlap 74-inch Reflecting Telescope for the Toronto University Observatory at Richmond Hill. View from N.W. side of Polar axis.

Enlarged photograph showing David Dunlap 74-inch Reflecting Telescope

1933

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

Six Bromide enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Bromide enlargements showing construction of equatorial refractor for Johannesburg observatory

1928

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

Five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Bromide enlargements showing construction of equatorial refractor for Nikolaieff observatory

1928

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia.

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory

1928

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia.

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory

1928

One of two enlarged photographs showing the David Dunlap 74-inch Reflecting Telescope for the Toronto University Observatory at Richmond Hil. View from S.S.E. side of Polar axis.

Enlarged photograph showing David Dunlap 74-inch Reflecting Telescope

1933

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons & Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938

Enlarged photograph showing the Johnston Yapp 36-inch Reflecting Telescope being built by Sir Howard Grubb, Parsons & Company for the Royal Observatory, Greenwich at its optical works at Newcastle-on-Tyne, England.

Enlarged photograph showing the Johnston Yapp 36-inch Reflecting Telescope being built by Sir Howard Grubb

1933

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons & Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia.

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory

1928

Photograph of 36-inch reflecting telescope made for the Royal Observatory, Edinburgh, by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Photograph of 36-inch reflecting telescope made for the Royal Observatory

1927-1928

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory, South Russia.

One of five Bromide enlargements showing construction of 41 inch equatorial refractor for Nikolaieff observatory

1928

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons & Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons and Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons & Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938

One of six photographic enlargements showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory, prepared from negatives lent by Sir Howard Grubb, Parsons and Co.

Photographic enlargement showing the construction of the 26-inch equatorial refracter for Johannesburg Observatory

1928

Photographs of the 40-inch Reflecting telescope built for the Stockholm Observatory, Sweden by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Photographs of the 40-inch Reflecting telescope built for the Stockholm Observatory

1927-1931

Photograph of the 24/20-inch twin refracting telescope built for the Stockholm Observatory, Sweden by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Photograph of the 24/20-inch twin refracting telescope built for the Stockholm Observatory

1927-1931

Two photographs showing the photographic breechpiece and focusser for the 40-inch reflecting telescope and the photographic breechpiece for the 24/40-inch twin refracting telescope at the Stockholm Observatory, Sweden. Both instruments were made by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Two photographs showing breechpieces and focusser from refracting telescope at the Stockholm Observatory

1927-1931

Section of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons & Company

Photographs and diagrams showing the design and construction of the Pretoria Reflecting Telescope

1938

Photograph of the 24/20-inch twin refracting telescope built for the Stockholm Observatory, Sweden by Sir Howard Grubb, Parsons & Company at their optical works in Newcastle-on-Tyne, England.

Photograph of the 24/20-inch twin refracting telescope built for the Stockholm Observatory

1927-1931

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope (WO ScM 269/58/1) built by Sir Howard Grubb, Parsons and Company

One of six photographs and diagrams showing the design and construction of the Pretoria 74-inch Reflecting Telescope

1938