General Information

Serial #

4B (CONDUIT)

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

WOOD BOX WITH LOUVRED SIDES & DOOR/ DOUBLE HEAT SHIELD ON TOP MADE OF ASBESTOS EMBEDDED IN PLASTER (?)/ METAL PIPE & CONDUIT, HARDWARE

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

73.7 cm

Width

52.1 cm

Height

91.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric humidity measurement

Sub-Category

N/A

Manufacturer

AKA

Environment CA

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

1950'S +

Canada

THE 2ND CANADIAN METEOROLOGICAL SERVICE VERSION OF THE STEVENSON SCREEN. A TYPE OF LOUVRED SCREEN WAS USED AT THE TORONTO OBSERVATORY FROM ITS FOUNDING IN 1839; IN THE 1870'S KINGSTON DEVELOPED ANOTHER FORM OF SCREEN THAT WAS STILL IN USE IN THE 1890'S. THIS SCREEN IS AN EXAMPLE OF THE MODERN SUCCESSOR TO THESE.

Function

A BOX WITH DOUBLE ROOF FOR PROTECTION FROM SUN & DOUBLE LOUVRED SIDES FOR VENTILATION, USED OUTDOORS TO CONTAIN METEOROLOGICAL INSTRUMENTS (MAINLY THERMOMETERS) IN ORDER TO PROTECT THEM FROM SOLAR RADIATION, THERMAL REFLECTION, PRECIPITATION ETC. AND OBTAIN MORE ACCURATE MEASUREMENTS OF AIR TEMPERATURE, ETC.

Technical

THE STEVENSON SCREEN WITH DOUBLE LOUVRED SIDES APPEARED IN 1864; THE LARGER WHITE PAINTED VERSION WITH A DOUBLE ROOF & STAGGERED FLOOR BOARDS WAS ADOPTED BY THE R.M.S. IN 1874. THE M.S.C. SCREEN OF THE 1920'S TO 1940'S IS OF THIS TYPE; IN THE EARLY 1950'S THE M.S.C. TYPE B WITH AN ASBESTOS ROOF WAS DEVELOPED.

Area Notes

Unknown

Details

Markings

INCISED LETTERING ON METAL PIPE READING 'PSY. TYPE 4B/ NO 211' & 'PSY.4B PT 2'/ CAST LETTERING ON CONDULET READING 'CROUSE-HINDS/ LL17 CONDULET/PATENTS ISSUED & PENDING' & INCISED LETTERING READING 'CROUSE-HINDS/ PATENTS ISSUED & PENDING/ 1/2 IN 170'/ RED HANDWRITTEN '211' & BLACK '12' ON TOP/ BLACK HANDWRITTEN '477' ON PIPE

Missing

APPEARS COMPLETE

Finish

BOX PAINTED WHITE/ GREY PIPE & CONDUIT/ GREY SHIELDS/ BRASS COLOURED HARDWARE

Decoration

N/A