Labelled A - main body. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part I - beam trap with dial at bottom to read position of crystal, driven by belt. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part II - X ray tube connection. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part IV - film holder. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part V – stand. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part VI. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part VII - parts of X-ray camera in bag. Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Labelled A part III - Part of X-ray camera components (labelled A), from a collection relating to the X-ray crystallography research carried out by Dame Kathleen Lonsdale at University College London.

Circular disk possibly made of brass, with three holes, one large two small, one small of the small holes has glass. Red wax or resin on back.