Renseignements généraux

Nº de série

6269

Nº de partie

1

Nombre total de parties

1

Ou

S/O

Brevets

S/O

Description générale

cupwheel, cups, shaft, dial casing, stand, parts/ synthetic or glass window/ synthetic parts

Dimensions

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

Longueur

S/O

Largeur

S/O

Hauteur

42,1 cm

Épaisseur

S/O

Poids

S/O

Diamètre

34,6 cm

Volume

S/O

Lexique

Groupe

Météorologie

Catégorie

Mesure de vitesse et direction du vent de surface

Sous-catégorie

S/O

Fabricant

Ou

Munro

Pays

England

État/province

Inconnu

Ville

London

Contexte

Pays

Canada

État/province

Inconnu

Période

1960s+; this instrument was apparently in use for 45 years (Ref. 5)

Canada

An example of an ancillary instrument used in the process of measuring evaporation by the Meteorological Service of Canada at observing sites across Canada. It was part of the array of equipment used with the MSC Class A evaporation pan and fixed point gauge , which were in use by 1961 and until at least the mid 1970's (see 2004.0349). Part of a large collection of meteorological instruments acquired from the Meteorological Service of Canada (previously Atmospheric Environment Service) by the CSTM since 1967. MSC is the government agency responsible for collecting and disseminating meteorological data and forecasts in Canada. It was founded in 1871 in Toronto where it is still headquartered. The MSC was originally on the University of Toronto downtown campus but moved to Downsview in 1971 on land owned by UofT. The headquarters houses laboratories, research facilities and calibration and instrument maintenance facilities (now largely contracted out).

Fonction

An instrument that measures wind velocity by means of a cupwheel, indicating on a digital dial indicator the total amount (in miles) of wind passing the point of observation over a given time.

Technique

This type of totalizing anemometer was mounted at about three feet off the ground beside the 4' wide Class A evaporation pan as part of the measurements. The total wind run in mph for a day was recorded in order to compute the lake evaporation (Ref. 1). Wind affects evaporation by bringing fresh samples of air in contact with the evaporation surface. This type of anemometer was used with the MSC evaporation pan and fixed point gauge 2003.0349. Other ancillary equipment used with the evaporation pan included a graduate for adding measured amounts of water to the pan (see 1987.0877 for a non MSC? evaporation graduate); mounted MSC/AES maximum thermometers (see 1987.0689 -1978.0690) and minimum thermometers (see 1987.0694 -1978.0695) in the evaporation pan and in a Stevenson screen (see 1967.1201); a standard MSC rain gauge (see 1987.0598 etc.) and graduate (see 1987.0602) (Refs. 2-3). The 1960's MSC Evaporation manuals (Refs. 2-3) mention a Casella anemometer as the standard instrument used by the M.S.C. for evaporation measurements. Those instruments were marked ‘Mark II Ref. Met. 2765' as is this Munro instrument 2004.0350, which appears to be identical to the Casella anemometer. The British Meteorological Office Mark II cup counter anemometer has a cup wheel consisting of three five inch diameter conical cups. The cupwheel spindle is connected by worm gearing to a revolution counter so that the counter indicates in miles and hundredths of miles. The counter reads up to 9999 miles before repeating itself (Ref. 4).

Notes sur la région

Inconnu

Détails

Marques

incised lettering on plate reads 'CUP COUNTER ANEMOMETER/ MARK II/ REF. MET. No 2765/ R.W. MUNRO LTD. LONDON N.11'/ white lettering on dial reads 'MILES 1/10 1/100/ incised lettering in casing reads '6269'/ black lettering on the back of one of the cups reads 'INVIORMENT [sic]/ CANADA'

Manque

appears complete

Fini

dial casing, cupwheel grey and pole painted?/ stand finish obscured by corrosion

Décoration

S/O