Renseignements généraux

Nº de série

S/O

Nº de partie

1

Nombre total de parties

2

Ou

S/O

Brevets

S/O

Description générale

.1 WOOD CASE WITH LEATHER HANDLE & METAL HARDWARE; METAL RHEOSTAT WITH SYNTHETIC PARTS; METAL METER CASING WITH GLASS DIAL COVER, SYNTHETIC PARTS/.2 METAL JACKS & WIRING, SYNTHETIC WIRE COVERING/ 2 UNIDENTIFIED PARTS: PLASTIC CASINGS, METAL WIRING, FIBRE CORD

Dimensions

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

Longueur

52,0 cm

Largeur

43,5 cm

Hauteur

18,5 cm

Épaisseur

S/O

Poids

S/O

Diamètre

S/O

Volume

S/O

Lexique

Groupe

Météorologie

Catégorie

Mesure hygrométrique de l'atmosphère

Sous-catégorie

S/O

Fabricant

Ou

PNFI

Pays

Canada

État/province

Ontario

Ville

Chalk River

Contexte

Pays

Canada

État/province

Ontario

Période

1930'S

Canada

INSTRUMENT BUILT BY MEMBERS OF CANADIAN FORESTRY SERVICE./ FROM COLLECTION OF FORESTRY & FIRE-FIGHTING EQUIPMENT USED BY & ACQUIRED FROM PNFI, CANADIAN GOV'T FORESTRY-RESEARCH ESTABLISHMENT WHICH OPERATED FROM 1918-1995. PNFI STUDIED SPECIES GROWTH & FOREST MANAGEMENT, PARTICULARLY FIRE PREVENTION & SUPPRESSION.

Fonction

INSTRUMENT USED TO MEASURE MOISTURE CONTENT IN TOP LAYER OF FUEL ON FOREST FLOOR IN ORDER TO ESTIMATE DANGER OF FOREST FIRE, PROBABLY USED EXPERIMENTALLY IN DEVELOPING FOREST FIRE DANGER RATING SYSTEM IN 1930'S. (.2 WAS SENSOR USED FOR SOIL MOISTURE MEASUREMENT - SEE SUPP. INFO.)

Technique

ONE-OF-A-KIND OR ONE-OF-A-FEW SPECIALISED INSTRUMENTS MADE BY PNFI, PROBABLY BY JAMES G. WRIGHT OF PNFI, UNDER WHOM RESEARCH INTO FIRE CONTROL BEGAN IN 1929. ADAPTATION OF LIMBRICK MOISTURE METER DEVELOPED BY CHARLES LIMBRICK, WHO WORKED FOR OTTAWA INSTRUMENT FIRM IN 1920'S. SENSOR WAS BLOCK OF PLASTER WITH TWO WIRES EMBEDDED WITHIN BY WHICH RESISTANCE WAS MEASURED.

Notes sur la région

Inconnu

Détails

Marques

DETACHED PLATE FROM RHEOSTAT READS "MADE IN U.S.A./ CENTRAL SCIENTIFIC CO./ AMP.25/ TRADE MARK CENCO REG. U.S. PAT. OFF./ 5890 OHM/ CENCO RHEOSTAT/ CHICAGO/ BOSTONTORONTO/ NEW YORK LOS ANGELES"/ LETTERING ON METERS FACES READS "PAT. NOV. 6,'88. APR. 29,'90. FEB. 17,'91. OCT. 4,'98. JULY 16,'01/ MILLIAMPERES D.C./ WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J.,U.S.A./ MODEL 301 NO. 857031"; "MILLIAMPERES D.C./ WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J., U.S.A./ MODEL 301 NO. 1023922"; VOLTS D.C./ 200/ OHMS PER VOLT/ WESTON ELECTRICAL INSTRUMENT CORP., NEWARK, N.J., U.S.A./ MODEL 301 NO. 1025114"/ LABELS ON 2 PARTS READ "MADE IN U.S.A./ M.C. STEWART/ ARLINGTON, MASS."

Manque

PLASTER SENSOR

Fini

UNFINISHED WOOD CASE/ BLACK PAINTED & METALLIC METAL PARTS/ COLOURLESS TRANSPARENT GLASS GREEN & BEIGE WIRE COVERING/ PARTS: BROWN PLASTIC CASINGS

Décoration

S/O