Photographic Zenith Tube (PTZ) and associated components used at the Royal Observatory Greenwich.
Photographic Zenith tube and cover used at the Royal Observatory Greenwich.
Five wooden boxes containing tools, components, and glass plates and holders for the Photographic Zenith tube used at the Royal Observatory Greenwich.
Lenscap, lenscap cover, reservoir support, mercury overflow tray, two semicircular plates and fixings for Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich.
Components belonging to the Photographic Zenith Tube (PZT) from the Royal Observatory Greenwich.
A disk-like component, painted grey, has a flat round platform with letters written on it. On top of this base is a second, slightly smaller circular section, with the cardinal directions marked on its side. From this area, three black cylindrical vertical pillars are attached. Attached to the side of the object is a motor, with a junction box lying on top of it.
A cream-painted telescope component is positioned above the main circular object, while another disk-shaped telescope component is stored in a bag on the same pallet.
Overhead shutter plate, one archival boxes of components, a long wooden box, and perforated steel mounting rails for the Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich.
Shutter mechanism and two cardboard boxes of components for the Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich. One box contains an autocollimator, a cream-painted component, and bagged components labelled ‘mercury collector pot’ and ‘screws and jointing plates for mercury tray.’ The second box contains an additional cylindrical electrical component and a plastic component.
Lifting trolley with winch for the Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich.
Two support beams for the shutter and crane of the Photographic Zenith Tube (PZT) used at the Royal Observatory Greenwich.
