Renseignements généraux

Nº de série

11161 (base)

Nº de partie

1

Nombre total de parties

4

Ou

telescope base (.1)

Brevets

S/O

Description générale

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

Remarque : Cette information reflète la taille générale pour l’entreposage et ne représente pas nécessairement les véritables dimensions de l’objet.

Longueur

66,5 cm

Largeur

36,0 cm

Hauteur

42,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Exploration et levé

Catégorie

Mesure-angle

Sous-catégorie

S/O

Fabricant

Ou

HEYDE

Pays

Allemagne

État/province

Inconnu

Ville

Dresde

Contexte

Pays

Canada

État/province

Inconnu

Période

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.

Fonction

TO DETERMINE TIME, LATITUDE, LONGITUDE & AZIMUTH IN ORDER TO ESTABLISH REFERENCE POINTS IN TRIANGULATION SURVEYS.

Technique

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).

Notes sur la région

Inconnu

Détails

Marques

.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.

Manque

UNKNOWN

Fini

.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

Décoration

S/O