Photographic Zenith Tube (PTZ) and associated components used at the Royal Observatory Greenwich.

Details

Category:
Astronomy
Object Number:
1990-758
Measurements:
Photographic Zenith Tube: 2090 mm x 2070 mm x 1430 mm,
type:
zenith telescope
credit:
Royal Greenwich Observatory, Herstmonceux

Parts

Photographic Zenith Tube (PTZ) and Cover

Photographic Zenith Tube (PTZ) and Cover

Photographic Zenith tube and cover used at the Royal Observatory Greenwich.

Measurements:
Photographic Zenith Tube: 2090 mm x 2070 mm x 1430 mm,
Object Number:
1990-758/1
type:
zenith telescope
Tools and Photographic Plates for PTZ

Tools and Photographic Plates for PTZ

Five wooden boxes containing tools, components, and glass plates and holders for the Photographic Zenith tube used at the Royal Observatory Greenwich.

Measurements:
overall: 249 mm x 1030 mm x 525 mm,
Object Number:
1990-758/2
type:
tools and photographic plates
Lenscap, lenscap cover, reservoir support, mercury overflow tray, plates and fixings for PTZ

Lenscap, lenscap cover, reservoir support, mercury overflow tray, plates and fixings for PTZ

Lenscap, lenscap cover, reservoir support, mercury overflow tray, two semicircular plates and fixings for Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich.

Measurements:
overall: 580 mm x 900 mm x 1160 mm,
Object Number:
1990-758/3
type:
components
Components for PTZ

Components for PTZ

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.

Measurements:
overall: 640 mm x 860 mm x 1100 mm,
Object Number:
1990-758/4
type:
components
Overhead shutter plate, railing, and two boxes of components for PTZ

Overhead shutter plate, railing, and two boxes of components for PTZ

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.

Measurements:
overall: 550 mm x 1400 mm x 1320 mm,
Object Number:
1990-758/5
type:
components
Shutter mechanism and two boxes of components for PTZ

Shutter mechanism and two boxes of components for PTZ

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.

Measurements:
overall: 580 mm x 1020 mm x 960 mm,
Object Number:
1990-758/6
type:
components
Lifting trolley with winch for PTZ

Lifting trolley with winch for PTZ

Lifting trolley with winch for the Photographic Zenith Tube (PTZ) used at the Royal Observatory Greenwich.

Measurements:
overall: 600 mm x 1220 mm x 600 mm,
Object Number:
1990-758/7
type:
components
Two support beams for PTZ

Two support beams for PTZ

Two support beams for the shutter and crane of the Photographic Zenith Tube (PZT) used at the Royal Observatory Greenwich.

Measurements:
overall: 130 mm x 3850 mm x 150 mm,
Materials:
metal (unknown)
Object Number:
1990-758/8
type:
beams (structural elements)