General Information

Serial #

30493

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

WOOD BASE/ CAST IRON/ BRASS

Dimensions

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

Length

95.6 cm

Width

28.2 cm

Height

31.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Meteorology

Category

Miscellaneous

Sub-Category

N/A

Manufacturer

AKA

NALDER

Country

England

State/Province

Unknown

City

Westminster

Context

Country

Canada

State/Province

Ontario

Period

1870'S +

Canada

A BRITISH MADE INSTRUMENT USED BY THE CANADIANMETEOROLOGICAL SERVICE EARLY IN ITS HISTORY, IN THE PRODUCTION OF INSTRUMENTS DESIGNED & BUILT BY THE SERVICE. SEE 1852 ARTICLE DISCUSSING THE POTENTIAL USE A DIVIDING ENGINE AT THE TORONTO MAGNETIC & METEOROLOGICAL OBSERVATORY (REF. 4 IN SUPP. INFO.).

Function

A DEVICE USED TO RULE A STRAIGHT LINE SCALE. AT AES IT WAS USED TO PRECISELY ENGRAVE LINEAR SCALES FOR METEOROLOGICAL INSTRUMENTS (T. HACKING, AES).

Technical

HAS RATCHETT MECHANISM FOR ADVANCING LEAD SCREW & ENGRAVING MECHANISM/ NUT ON LEAD SCREW CONTACTS SCREW BY MEANS OF 4 GEARED WHEELS TO REDUCE BACKLASH/ STOP IS INTEGRAL PART OF WHEEL/ ENGRAVING TOOL HAS 3 SCREWS WHICH CONTACT NOTCHES IN A WHEEL TO DETERMINE LENGTH OF ENGRAVED LINE (SHORT, MEDIUM, LONG).

Area Notes

Unknown

Details

Markings

PLATE READING 'NALDER BROS. & CO./ WESTMINISTER/ NO. 30, 493'/ INCISED BLACK MARKINGS ON METALLIC SCALE

Missing

STRING ATTACHED TO ENGRAVING TOOL TO LIFT POINT AFTER STROKE OF ENGRAVER POINT/ ENGRAVER POINT REPLACED BY WHAT APPEARS TO BE A DENTAL BURR SHARPENED AT THE PROXIMAL END.

Finish

VARNISHED WOOD/ BLACKENED BED/ BRASS & METALLIC PARTS/ BLACK ENAMEL PAINTED PARTS

Decoration

N/A