General Information

Serial #

N/A

Part Number

1

Total Parts

21

AKA

N/A

Patents

N/A

General Description

METAL (MOSTLY BRASS), WITH GLASS & SYNTHETIC

Dimensions

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

Length

104.5 cm

Width

58.0 cm

Height

30.3 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Astronomy

Category

Observation equipment

Sub-Category

N/A

Manufacturer

AKA

Troughton Simms

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Ontario

Period

PROBABLY FROM 1905 (OR EARLIER) TO 1956 OR 1957

Canada

USED AT THE DOMINION OBSERVATORY IN OTTAWA.

Function

TO DETERMINE TIME BY OBSERVATION OF STELLAR TRANSITS/ USED IN CONJUNCTION WITH A REGULATOR CLOCK OR CHRONOGRAPH & EYEPIECE MICROMETER/ TIME DIFFERENCE FROM GREENWICH TIME EQUALS LONGITUDE OF LOCATION/ SUCH AN INSTRUMENT WOULD BE ACCURATE IN SERIES OF OBSERVATIONS OVER SEVERAL DAYS TO A FRACTION OF A SECOND OF TIME

Technical

TYPICAL ASTRONOMICAL TRANSIT BY PREMIER ENGLISH MAKERS/ WOULD BE OF SECONDARY LEVEL ACCURACY - LIMITED MAINLY BY THE FOCAL LENGTH, THE ACCURACY OF THE STRIDE LEVEL, CARE TAKEN TO ALIGN BASE & THE NUMBER OF STELLAR TRANSITS OBSERVED/ PERSONAL EQUATION ERRORS NEEDED TO BE KNOWN & APPLIED

Area Notes

Unknown

Details

Markings

ENGRAVED 'TROUGHTON & SIMMS/ LONDON', LEVELS HAVE SCALES MARKED OFF, 1 FROM 0-40 & 2 FROM 0-20 (IN 2 DIRECTIONS)

Missing

N/A

Finish

BRASS COLOUR, SOMEWHAT TARNISHED, REDDISH-COLOURED & SILVER- COLOURED PTS

Decoration

N/A