General Information

Serial #

217625

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

Glass inner and outer tubes, metal parts/wood box.

Dimensions

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

Length

44.7 cm

Width

8.8 cm

Height

9.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Atmospheric temperature measurement

Sub-Category

N/A

Manufacturer

AKA

Negretti Zambra

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Unknown

Period

Unknown

Canada

A TYPE OF INSTRUMENT USED AT AT LEAST 1 CANADIAN OBSERVING STATION.

Function

INSTRUMENT THAT MEASURES THE RADIANT HEAT OF THE SUN, USING A BLACK PAINTED THERMOMETER, PROTECTED FROM THE WIND BY A GLASS JACKET.

Technical

IN 1864 NEGRETTI & ZAMBRA CLAIMED TO HAVE INVENTED A BLACK BULB SOLAR RADIATION THERMOMETER WITH AN EVACUATED GLASS JACKET. IN 1938 N & Z WERE STILL SELLING A DIFFERENT VERSION, WITH THE BULB & 1 INCH OF THE STRAIGHT STEM BLACKENED; THIS EXAMPLE IS OF THIS TYPE. PROBLEMS WITH MAINTAINING THE VACUUM & STANDARDIZATION OF THIS TYPE OF THERMOMETER LED TO ITS GRADUAL ABANDONMENT.

Area Notes

Unknown

Details

Markings

Black lettering on glass of inner tube reading 'Negretti & Zambra's Patent, London 217625' & 'KO18', with markings for 10 to 190.

Missing

From CA of 12/21/1993 by Tony Missio: No - Complete

Finish

Clear and colourless glass with white backed inner tube/ spherical black bulb on inner tube.

Decoration

N/A