General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

GLASS PLATE/ BRASS SCALE, INDICATOR, SUPPORT.

Dimensions

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

Length

N/A

Width

25.2 cm

Height

5.9 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Cloud height & motion measurement

Sub-Category

N/A

Manufacturer

AKA

GRAFF

Country

United States of America

State/Province

New York

City

New York

Context

Country

Canada

State/Province

Unknown

Period

PROBABLY 20TH CENTURY

Canada

AN AMERICAN MADE INSTRUMENT USED BY THE CANADIAN METEOROLOGICAL SERVICE OF CANADA; INSTRUMENTS OF THIS TYPE WERE NOT PART OF THE EQUIPMENT NORMALLY ASSIGNED TO ORDINARY METEOROLOGICAL OBSERVING STATIONS ACROSSCANADA; IT MAY HAVE BEEN USED AT THE MAIN OBSERVATORY IN TORONTO.

Function

INSTRUMENT USED TO MEASURE THE SPEED & DIRECTION OF CLOUDS, BY MEANS OF THE CLOUD IMAGE REFLECTED ON THE MIRROR SURFACE, THE MOVEMENT OF WHICH IS MEASURED AGAINST THE GRADUATED SCALE OF THE NEPHOSCOPE.

Technical

ARTIFACT IS A FINEMAN TYPE REFLECTING NEPHOSCOPE, WITH A GLASS DISK BLACKED AT THE BACK & HAVING ENGRAVED WHITE LINES ON THE FRONT. A BRASS SCALE ENCIRCLES THE DISK. SEE ILLUSTRATION OF SIMILAR INSTRUMENT IN REFERENCE 1 (SUPP. INFO.) THE FINEMAN MIRROR NEPHOSCOPE WAS DEVELOPED IN 1886 & CONSISTS OF A DISK OF BLACK GLASS WITH ENGRAVED CONCENTRIC LINES, A COMPASS, & A POINTER. THE CLOUD IMAGE IS LINED UP WITH THE POINTER & THE CENTRE OF THE DISK, & THE CLOUD DIRECTION READ FROM THE GRADUATION ON THE EDGE OF THE DISK.

Area Notes

Unknown

Details

Markings

LETTERING STAMPED INTO BRASS ON UNDERSIDE READING 'GRAFF, WASHBOURNE & DUNN/ NEW YORK'.

Missing

APPEARS COMPLETE

Finish

GLASS BLACKED AT BACK WITH FINE WHITE LINES ON FRONT/ BRASS COLOURED METAL.

Decoration

BEVELED EDGE ON CIRCULAR GLASS PLATE.