Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

CAST IRON; COPPER ALLOY; PLATINUM; GLASS; ALUMINUM; STAINLESS STEEL; FERROUS METAL. CW PHOTOGRAPH-PAPER & PHOTOGRAPHIC CHEMICAL COMPOSITION.

Dimensions

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

Longueur

69,0 cm

Largeur

39,5 cm

Hauteur

45,0 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Exploration et levé

Catégorie

Photogrammétrie

Sous-catégorie

S/O

Fabricant

Ou

POCKLINGTON

Pays

Canada

État/province

Ontario

Ville

Toronto

Contexte

Pays

Canada

État/province

Inconnu

Période

THIS TYPE OF INSTRUMENT PROBABLY USED 1940S-1950S, AND POSSILY LATER

Canada

PART OF A COLLECTION OF HISTORIC MATERIALS FROM SURVEYS & MAPPING BRANCH, ENERGY, MINES & RESOURCES CANADA [NOW NATURALRESOURCES CANADA]. THIS PHOTOALIDADE MADE IN CANADA BY WELL KNOWN & LONG ESTABLISHED FIRM: CIRCLE & ARCS DIVIDED ON 921776 POCKLINGTON DIVIDING ENGINE.

Fonction

TO MEASURE HORIZONTAL & VERTICAL ANGLES FROM AN OBLIQUE PHOTOGRAPH. USED FOR HORIZONTAL & VERTICAL POINT SELECTION FROM HORIZONTAL PHOTOGRAPHS.

Technique

PHOTOALIDADE IS USED FOR PLOTTING LINES OF DIRECTION, AND MEASURING ANGLES TO SELECTED FEATURES ON OBLIQUE & TERRESTRIAL PHOTOGRAPHS (REF.2). IT WAS INTRODUCED IN 1937. WHEN PHOTOS ARE CORRECTLY ADJUSTED IN THE PHOTOALIDADE, OBSERVATIONS ARE TAKEN IN THE SAME MANNER AS WITH A PLANE TABLE & TELESCOPIC ALIDADE/ PRECISION IS CONSISTANT IN POSITION & ELEVATION WITH VALUES OBTAINED BY PLANE TABLE & TELESCOPIC ALIDADE, BUT RESULTS ARE OBTAINED MORE QUICKLY USING THE PHOTOALIDADE. (MANUAL OF PHOTOGRAMMETRY, 1944)

Notes sur la région

Inconnu

Détails

Marques

'THE/ THOS. POCKLINGTON CO./ TORONTO, CANADA' INCISED ON CIRCLE CENTRE. SMALL BRASS PLATE STAMPED '1' SCREWED TO RIGHT SIDE OF BASE. DECAL APPLIED TO BASE READS: 'EMR/ INVENTORY CONTROL-/ R.C. C.R. 634 007043/ EQ. CODE D'EQUIPE 6675-21-AAA-0259/ DO NOT REMOVE NE PAS ENLEVER'. CIRCLE DIVIDED 0-360 BY30 SECONDS. VERTICAL ARC DIVIDED 60-0-60 AT 30-SECOND INTERVALS; VERNIER DIVIDED +30-0-30+, READING TO MINUTES

Manque

APPEARS COMPLETE. TUBE LEVEL ON PHOTO MOUNTING PLATE IS CONTEMPORARY, BUT NOT ORIGINAL TO THIS INSTRUMENT.

Fini

MOST SURFACES HAVE BLACK CRACKLE FINISH. CIRCLE & ARCS HAVE SMOOTH, BRIGHT SILVER METAL (PLATINUM) FINISH. GLASS PLATE SUPPORT FOR PHOTOGRAPH HAS BRUSHED SILVER METAL FINISH. ADJUSTMENT KNOBS, FINE ADJUSTMENT FITTINGS, MOUNTINGS FOR TUBE LEVEL CASINGS, ETC. LACQUERED BRASS. CLEAR GLASS PHOTO SUPPORT & LEVEL VIALS.

Décoration

S/O