Comparator part

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OBJECT TYPE
optical comparator/spectrograph
DATE
1967
ARTIFACT NUMBER
2008.1885.002
MANUFACTURER
Boston Gear Works Inc.
MODEL
Unknown
LOCATION
Quincy, Massachusetts, United States of America

More Information


General Information

Serial #
N/A
Part Number
2
Total Parts
4
AKA
N/A
Patents
N/A
General Description
An artifact comprised of metal elements/Un objet fait avec du matériel en métal.

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length
30.9 cm
Width
23.3 cm
Height
32.4 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Chemistry
Category
Test-measurement equipment
Sub-Category
N/A

Manufacturer

AKA
Boston
Country
United States of America
State/Province
Massachusetts
City
Quincy

Context

Country
Canada
State/Province
Ontario
Period
1967-1990s
Canada
The vacuum Ebert spectrograph, developed by Donald A. Ramsey at the NRC, was a central instrument in Canada’s contributions to spectroscopy from approximately 1950 to the 1990s. Lead by Nobel Laureate, Gerhard Herzberg, Canada was a leader in this part of physics in the post WWII era. Using this device, D.A. Ramsey and Barry Lutz were able to confirm that the Kuiper bands of Uranus were made of methane. This finding had eluded scientists since the early days of astrophysics. Ramsey, a gifted experimenter, was able to produce this extremely high-resolution spectrograph, in order to determine the origins of the bands in the laboratory. The laboratory findings were compared with Lutz’s observations and measurements of the Uranus bands. The measurements were based on observations taken at the Mount Hamilton Station of the Lick Observatory, California. Le spectrographe Ebert avec une pression à vide était conçu au NRC par Donald A. Ramsey. L'instrument était primordial pour que le Canada puisse contribuer au domaine de spectroscopie pour plus de quarante ans entre 1950 et les années 1990s. La recherche était menée par Gerhard Herzberg qui était un lauréat pour le prix Nobel. Canada est rapidement devenu le meneur dans ce domaine de la physique après la deuxième Guerre Mondial avec Herzberg en charge. M. Ramsey et Barry Lutz ont réussit à confirmer que les bandes Kuipers de l'Uranus sont faits en méthane en utilisant cette machine. La découverte échappait aux scientifiques depuis l'enfance de l'astrophysique. Ramsey était capable de produire ce spectrographe à haute résolution pour déterminer l'origine des bandes au laboratoire. Le scientifique a pu comparer ces résultats avec ceux de Lutz. Les deux séries de mesurément étaient pris à la station de Mont Hamilton a l'observatoire Lick en Californie.
Function
The function of this optical comparator part is unclear. La fonction de ce morceau de comparateur n’est pas encore déterminée.
Technical
This type of spectrograph dates back to the work of Hermann Ebert in 1889. He developed a spectrometer that consisted of an entrance slit, a single concave spherical mirror, a diffraction grating, and a small photographic plate in the plane of the entrance slit. This artifact is a Ramsey spectrograph, a 33-meter multiple-path cell, that produced spectra of the highest resolution at the time. The main body of this spectrograph was made by Fleck Industries before being installed at the NRC. Despite difficult struggles with leaks in the early construction phase of the optical components, large leak detectors (as big as fridges at the time) were installed and used to locate and fix the leaks. The resultant vacuum conditions allowed for much longer exposures and more precise images. This instrument was also a success due to its optics. The initial resolution of the instrument was not as good as expected, and a new mirror had to be ground and installed. The resolution improved significantly. There were also two gratings in this model, one high and the other low resolution. Ce genre de spectrographe est inspiré par le travail de Hermann Ebert en 1889. Il a développé un spectromètre qui possédait une fente d'entrée, un miroir concave et sphérique, un réseau de diffraction et une plaque photographique située sur le plan de la fente d'entrée. Cet artefact est un spectrographe Ramsey qui possède un trajet-multiple de plus de trente-trois mètres qui produisaient une résolution de la plus haute qualité de sa génération. Le corps du spectrographe était fabriqué par Fleck Industries. Malgré les fuites au début de la phase de construction des composantes optiques, l'installation des détecteurs de fuites installer par la suite ont réussi à trouver et arrêter le déluge. Les conditions après l'installation a construit des conditions de pression à vide qui permettait à la machine de développer des images plus précises avec une exposition prolongée. L'instrument était aussi favori grâce à ces composantes optiques. La résolution initiale n'était pas une haute gamme et donc un nouveau miroir a dû être dépoli et installer. Ceci a augmenté la résolution a un niveau requis. Il y avait aussi deux genres de réseau qui accompagnaient ce modèle qui permettait à une résolution base ou celui qui apportait une résolution plus augmentée.
Area Notes
Unknown

Details

Markings
On the feet of the artifact/Sur les pieds de l'artefact:"BOSTON Gear/J50B/MADE BY BOSTON GEAR WORKS/QUINCY MASS. U.S.A.".
Missing
Seems complete/L’objet semble complet.
Finish
This artifact has a tube-shaped body and a square back. The body is made of a combination of silver coloured steel and brass metal. The top of the artifact has two metal rods that extend upwards. The heads of the rods are covered in black metal sleeves. When the rods are rotated they either make a gear turn on the proper left side of the artifact or they make a small metal door rise and fall on the back of the artifact. The movement of the door reveals a small aperture. The proper left side of the artifact has its silver metal gear contained in a small brass coloured metal box. The base of this artifact is flat. It appears as if the object can be fastened to another artifact. Cet artefact est fait en forme de tuyau et il possède aussi un dos en forme carrée. Le corps de l'artefact est fait avec du métal en acier et en laiton. Le dessus de l'objet a deux tiges en métal qui sont recouverts avec des manches en métal de couleur noire. Quand les tiges sont pivotées soit il tourne une roue d'engrenage où il fait monter et descendre une porte pour démontrer une fenêtre. Le bon côté gauche de l'artefact a une boite fait en laiton qui recouvre la roue d'engrenage fait en métal de couleur argent. La base de l'objet est plate et il semble s'attacher à un autre artefact.
Decoration
The manufacturer is engraved on the feet of the artifact on their black metal sleeves. Le nom du fabricateur est gravé sur les pieds en métal de l'artefact.

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Boston Gear Works Inc., Comparator part, circa 1967, Artifact no. 2008.1885, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/2008.1885.002/

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