Epidiascope

Use this image

Can I reuse this image without permission? Yes

Object images on the Ingenium Collection’s portal have the following Creative Commons license:

Copyright Ingenium / CC BY-NC-ND (Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)

ATTRIBUTE THIS IMAGE

Ingenium, 2008.0187.001
Permalink:

Ingenium is releasing this image under the Creative Commons licensing framework, and encourages downloading and reuse for non-commercial purposes. Please acknowledge Ingenium and cite the artifact number.

DOWNLOAD IMAGE

PURCHASE THIS IMAGE

This image is free for non-commercial use.

For commercial use, please consult our Reproduction Fees and contact us to purchase the image.

OBJECT TYPE
N/A
DATE
1955–1970
ARTIFACT NUMBER
2008.0187.001
MANUFACTURER
Leitz, Ernst GmbH
MODEL
Epi-Diaskop Vh 2/ 31-073.000
LOCATION
Wetzlar, Federal Republic of Germany

More Information


General Information

Serial #
41575
Part Number
1
Total Parts
6
AKA
N/A
Patents
N/A
General Description
Metal casing, parts, feet/ Synthetic lens caps, controls and parts/ Glass optical elements

Dimensions

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

Length
113.0 cm
Width
35.5 cm
Height
59.5 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Astronomy
Category
Research
Sub-Category
N/A

Manufacturer

AKA
Leitz
Country
Federal Republic of Germany
State/Province
Unknown
City
Wetzlar

Context

Country
Canada
State/Province
Ontario
Period
1955 - 1970 +
Canada
An instrument used at the David Dunlap Observatory at the University of Toronto, one of Canada's most important astronomical observatories. The David Dunlap Observatory opened in 1935 as the result of a bequest from the wife of David Dunlap. The telescope was a 74 inch (188 cm) reflector built by Grubb Parsons of Newcastle-upon-Tyne in England. The 74 inch was then the largest telescope in Canada (surpassing the 72 inch telescope of the Dominion Astrophysical Observatory in Victoria) and became the second largest in the world after the 100 inch Hooker Telescope of the Mt. Wilson Observatory outside Los Angeles. DDO's reputation grew and following WWII, it began to graduate most of the astronomers produced in Canada with University of Western Ontario far behind. Beginning in the 1960s a number of other astronomy departments were created but UofT/DDO held its place, a position it probably still holds. The DDO had a good technical staff which gave them an advantage and, with most of the 1940s to early 1970s top astronomers coming from UofT, grants from NRC and then ENSERC were almost guaranteed and allowed UofT's top astronomers -- Hogg, van den Berg, Fernie, Bolton, Kamper, Martin, etc. to acquire or build some of the best equipment available in university observatories. For optical observatories, only the DAO had technical staff and budgets that surpassed those of DDO. In 2007, citing increasing light pollution, the University of Toronto announced plans to sell the Observatory property. In June 2008, it was sold to Corsica Development Inc., a subsidiary of Metrus Development Inc. and the Observatory was closed. In 2009 the Observatory buildings and 80% of the site were designated a cultural heritage landscape. Also in 2009 Corsica and the Royal Astronomical Society of Canada, Toronto Centre announced an agreement allowing the RASC to provide public education and outreach programs at the observatory, and to operate the 188 cm telescope.
Function
An epidiascope is a device used to project images of both opaque and transparent images, typically used to project images of book pages, drawings, mineral specimens, leaves, etc.
Technical
An example of a large epidiascope. This device was used to show mounted glass slides in lectures and colloquia. A book or diagram could be placed in the opening on the side to project that as well. The hammertone finish of this instrument suggests a date of manufacture of circa 1955 to 1970. This device displays opaque materials by shining a bright lamp onto the object from above. A system of mirrors, prisms and/or imaging lenses is used to focus an image of the material onto a viewing screen. Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors and so generate more heat than an overhead projector.
Area Notes
Unknown

Details

Markings
Label on back reads 'ERNST LEITZ GMBH WETZLAR/ Epi-Diaskop Vh 2/ Type: 31-073.000 No. 41575/ 110/120 V 220/230/240 V 60 Hz. (c.p.s.)/ P1040 W max 50 W 1000 W max/ FO/ MADE IN GERMANY'/ White lettering on lens housing reads 'LEITZ WETZLAR GERMANY' and 'EPIS 1: 4.3/500mm'/ Black lettering on small lens housing reads 'LEITZ WETZLAR GERMANY' and 'f=250mm'
Missing
Unknown
Finish
Glossy grey hammertone painted casing/ Black painted textured casing top grille/ Black lens caps/ Plated part/ Colourless transparent glass/ White switch/ Black parts and power cord covering
Decoration
N/A

CITE THIS OBJECT

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

Leitz, Ernst GmbH, Epidiascope, circa 1955–1970, Artifact no. 2008.0187, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/item/2008.0187.001/

FEEDBACK

Submit a question or comment about this artifact.

More Like This


No image available.
Photometer

2008.0200.001

Object

...
Insert, boot

2008.0239.002

Object

...
Cap, flying

2008.0241.001

Object

...
Photometer

2008.0197.002

Object

No image available.
Suspenders

2008.0240.002

Object

...
Camera

2008.0204.001

Object

No image available.
Magnifier

2008.0210.001

Object

No image available.
Polarimeter

2008.0194.001

Object

No image available.
Engine, measu…

2008.0186.001

Object

No image available.
Sign

2008.0177.001

Object

No image available.
Software

2008.0434.005

Object

...
Interface

2008.0179.002

Object

...
Mouse

2008.0214.004

Object

No image available.
Cabinet

2008.0183.002

Object

No image available.
Suit, flying

2008.0237.001

Object

No image available.
Suit, flying

2008.0238.001

Object

...
Engine, measu…

2008.0202.001

Object

...
Photometer

2008.0196.001

Object

No image available.
Coelostat

2008.0188.001

Object

No image available.
Vacuum tube

2008.0222.001

Object

No image available.
Vacuum tube

2008.0223.001

Object

No image available.
Vacuum tube

2008.0224.001

Object

No image available.
Vacuum tube

2008.0225.001

Object

No image available.
Vacuum tube

2008.0226.001

Object

No image available.
Vacuum tube

2008.0227.001

Object

No image available.
Vacuum tube

2008.0228.001

Object

No image available.
Software

2008.0435.001

Object

No image available.
Software

2008.0245.005

Object

No image available.
Software

2008.0245.007

Object

No image available.
Software

2008.0434.001

Object

No image available.
Software

2008.0434.003

Object

No image available.
Trousers, fly…

2008.0239.001

Object

No image available.
Trousers, fly…

2008.0240.001

Object

No image available.
Controller

2008.0179.003

Object

...
Receiver, rad…

2008.0242.001

Object

...
Keyboard, com…

2008.0214.003

Object

No image available.
Engine, measu…

2008.0201.001

Object

No image available.
Photograph

2008.0233.001

Object

No image available.
Photograph

2008.0233.003

Object

No image available.
Photograph

2008.0234.003

Object

No image available.
Photograph

2008.0235.001

Object

No image available.
Photograph

2008.0235.003

Object

...
Electrometer

2008.0207.001

Object

No image available.
Seismograph

2008.0193.001

Object

No image available.
Controller

2008.0179.001

Object

No image available.
Software

2008.0436.001

Object

No image available.
Software

2008.0436.003

Object

No image available.
Software

2008.0245.001

Object

No image available.
Software

2008.0245.003

Object

No image available.
Software

2008.0433.001

Object

No image available.
Software

2008.0433.003

Object

No image available.
Software

2008.0433.005

Object

No image available.
Engine, measu…

2008.0183.001

Object

...
Monitor, comp…

2008.0214.002

Object

No image available.
Mouse

2008.0218.001

Object

No image available.
Software

2008.0432.007

Object

No image available.
Keyboard, com…

2008.0219.001

Object

...
Holder, photo…

2008.0190.001

Object

No image available.
Photograph

2008.0231.001

Object

No image available.
Photograph

2008.0231.003

Object

No image available.
Photograph

2008.0236.001

Object

No image available.
Photograph

2008.0236.003

Object

No image available.
Spectrograph

2008.0189.001

Object

No image available.
Photograph

2008.0232.003

Object

No image available.
Photograph

2008.0234.001

Object

No image available.
Tape, data pr…

2008.0244.001

Object

No image available.
Tape, data pr…

2008.0244.002

Object

No image available.
Tape, data pr…

2008.0244.003

Object

...
Computer

2008.0215.001

Object

...
Drive, tape

2008.0212.001

Object

No image available.
Software

2008.0431.001

Object

No image available.
Software

2008.0437.001

Object

No image available.
Photograph

2008.0232.001

Object

No image available.
Power supply

2008.0181.001

Object

No image available.
Power supply

2008.0199.001

Object

No image available.
Photomultipli…

2008.0197.004

Object

...
Photomultipli…

2008.0198.001

Object

No image available.
Mouse

2008.0217.001

Object

No image available.
Software

2008.0432.001

Object

No image available.
Software

2008.0432.002

Object

No image available.
Software

2008.0432.003

Object

No image available.
Software

2008.0432.004

Object

No image available.
Software

2008.0432.005

Object

No image available.
Photograph

2008.0230.001

Object

No image available.
Photograph

2008.0230.003

Object

...
Power supply

1969.0747.002

Object

No image available.
Engine, measu…

2008.0182.001

Object

...
Monitor, wave…

2008.0195.001

Object

No image available.
Photomultipli…

2008.0197.003

Object

No image available.
Photometer

2008.0197.001

Object

No image available.
Photograph

2008.0229.001

Object

No image available.
Photograph

2008.0229.003

Object

No image available.
Photograph

2008.0229.005

Object

No image available.
Photograph

2008.0229.007

Object

No image available.
Photograph

2008.0229.009

Object

No image available.
Tape, data pr…

2008.0243.001

Object

No image available.
Tape, data pr…

2008.0243.002

Object

No image available.
Tape, data pr…

2008.0243.003

Object

...
Monochromator

2008.0192.001

Object

...
Picoammeter

2008.0208.001

Object