Telescope, transit

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OBJECT TYPE
AXIS VIEW/PORTABLE/ROTATING AXIS
DATE
1910
ARTIFACT NUMBER
1990.0282.002
MANUFACTURER
HEYDE, GUSTAV GMBH
MODEL
Unknown
LOCATION
Dresden, Germany

More Information


General Information

Serial #
N/A
Part Number
2
Total Parts
4
AKA
N/A
Patents
N/A
General Description
PRIMARILY BRASS; VERTICAL CIRCLE & VERNIERS GRADUATED ON SILVER. GLASS TUBE LEVELS & OPTICS. CELLULOID SHADES ON READING MICROSCOPE EYEPIECES OVER VERTICAL CIRCLE..1PT &.2PT CASES MADE OF WOOD. CIRCLE ON LEVELLING LEG ON.1 BASE MAY BE DIVIDED ON PLATINUM

Dimensions

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

Length
57.0 cm
Width
33.0 cm
Height
33.0 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Exploration and Survey
Category
Measurement-angles
Sub-Category
N/A

Manufacturer

AKA
HEYDE
Country
Germany
State/Province
Unknown
City
Dresden

Context

Country
Canada
State/Province
Unknown
Period
THIS TYPE OF INSTRUMENT USED C.1910+. THIS INSTRUMENT PROBABLY USED C.1915-1960S.
Canada
ORIGINALLY PURCHASED C.1915 BY DOMINION OBSERVATORY, ALONG WITH TWO OTHER ASTRONOMICAL TRANSITS. AS A HIGHLY PRECISE, PORTABLE TRANSIT INSTRUMENT IT WAS PROBABLY USED ON MANY SURVEYS BY GEOLOGICAL SURVEY OF CANADA (GSC), TO WHOM IT WAS LOANED. IT CONTINUED TO BE USED BY GEODETIC SURVEY IN THE 1960S.
Function
TO DETERMINE TIME, LATITUDE, LONGITUDE & AZIMUTH IN ORDER TO ESTABLISH REFERENCE POINTS IN TRIANGULATION SURVEYS.
Technical
THIS TYPE OF PORTABLE TRANSIT INSTRUMENT IS KNOWN AS THE BROKEN-TELESCOPE TRANSIT: THE LIGHT WHICH PASSES THROUGH THE OBJECT GLASS IS REFLECTED THROUGH A RIGHT ANGLE BY MEANS OF A PRISM PLACED IN THE TRUNNION AXIS. AN EYE PIECE IS FITTED AT ONE END OF THE HOLLOW AXIS & A LAMP AT THE OTHER. BECAUSE OF THIS OPTICAL DESIGN THE STANDARDS CAN BE MADE LOWER AND THE INSTRUMENT MORE COMPACT (REF.3,P.62).
Area Notes
Unknown

Details

Markings
TRANSIT TELESCOPE BEARS EMR INVENTORY LABEL: IDENTICAL TO .1 EXCEPT EQ. NO. '633 024618/ 6675-66-666-6665'. VERTICAL CIRCLE DIVIDED 0-360 AT 15-MINUTE INTERVALS: READ BY VERNIER DIVIDED 0-20 AT 30-SECOND INTERVALS. TUBE LEVEL ON CIRCLE GRADUATED BUT NOT LABELLED./ .2PT- CASE: WOODEN CASE, PAINTED WHITE. PAPER LABEL ON CASE TOP READS: "ASTRONOMICAL/ INSTRUMENTS/ WITH CARE". Second label stapled to tops printed, with some handwriten text: "2 PACKAGES/ IN THIS SHIPMENT./ TO THE STOREKEEPER,/ GEODETIC SURVEY OF CANADA,/ OTTAWA, ONT./ Via P.W.A. AIRFREIGHT [TO ED]MONTON/ CN EXPRESS TO [OTT]AWA/ From/ Chief of Party/ LESLIE F. GREGERSON/ GEODETIC SURVEY PARTY"./ "# 208" HANDWRITTEN IN BLACK MARKER ON INSIDE OF LID OF CASE.
Missing
TRANSIT INSTRUMENT APPEARS TO HAVE BEEN REFINISHED AND PROBABLY ALTERED FOR USE BY GSC INTO 1960S.
Finish
HAS LIGHT & MEDIUM GREY ENAMEL FINISH (NOT ORIGINAL); GREEN ENAMEL FINISH ON COUNTERWEIGHTS. ADJUSTMENT KNOBS & SOME COMPONENT PIECES ARE NICKEL-PLATED. OFF-WHITE CELLULOID SHADES: READING EYEPIECES ARE BLACK WITH BRASS TUBES/ .2PT- CASE: WOODEN CASE, PAINTED WHITE.
Decoration
N/A

CITE THIS OBJECT

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

HEYDE, GUSTAV GMBH, Telescope, transit, circa 1910, Artifact no. 1990.0282, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/1990.0282.002/

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