Telescope, transit

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OBJECT TYPE
AXIS VIEW/PORTABLE/ROTATING AXIS
DATE
1910
ARTIFACT NUMBER
1990.0282.001
MANUFACTURER
HEYDE, GUSTAV GMBH
MODEL
Unknown
LOCATION
Dresden, Germany

More Information


General Information

Serial #
11161 (base)
Part Number
1
Total Parts
4
AKA
telescope base (.1)
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
66.5 cm
Width
36.0 cm
Height
42.5 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
.1 PLATE ON BASE READS: 'Gustav Heyde/ G.m.b.H./ Dresden- N 23/ Nr. 11141'. EMR INVENTORY LABEL READS: 'EMR/ INVENTORY CONTROL-/ R.C./ EQ. CODE/ 633 024610/ 5825-66-666-6666/ DO NOT REMOVE'- FRENCH TEXT ALSO PRESENT. LEVELLING LEG CIRCLE GRADUATED 0-99 BY SINGLE INCREMENTS. TUBE LEVEL GRADUATED BUT NOT LABELLED/ 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
UNKNOWN
Finish
.1 BASE: FINISH IS ORIGINAL BLACK ENAMEL; ADJUSTMENT KNOBS & SOME FITTINGS NICKEL-PLATED; BLACK SYNTHETIC KNOB ON AXIS LEVER; SILVER METAL LEVELLING LEG. TUBE LEVEL (NOT ORIGINAL) HAS GREY ENAMEL CASING/ .1PT- 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/1990.0282.001/

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