General Information

Serial #

N/A

Part Number

1

Total Parts

3

AKA

N/A

Patents

N/A

General Description

IRON BASE & TRIER PLATFORM; GERMAN SILVER SCALES; BRASS FITTINGS. CASE IS WOOD & GLASS, WITH CAST METAL ADJUSTMENT KNOBS/ (NB: NICKEL OR GERMAN SILVER IS AN ALLOY OF COPPER, NICKEL & ZINC; IT CONTAINS NO SILVER)

Dimensions

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

Length

55.0 cm

Width

15.0 cm

Height

12.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Astronomy

Category

Miscellaneous

Sub-Category

N/A

Manufacturer

AKA

Berger

Country

United States of America

State/Province

Massachusetts

City

Boston

Context

Country

Canada

State/Province

Unknown

Period

PROBABLY USED C. 1900-1950S

Canada

USED BY TOPOGRAPHICAL SURVEY OF CANADA TO COLLIMATE SURVEY INSTRUMENTS. MODIFIED DESIGNINCLUDING LEVEL ON BASE & AUXILLIARY SCREW BELOW MICROMETER SCREW SUGGESTS THIS TRIER MAY HAVE BEEN USED FOR ASTRONOMICAL INSTRUMENTS (CAPABLE OF PRECISE MEASUREMENT). (REF.1, P.125)

Function

TO TEST THE SENSITIVITY & REGULARITIY OF CURVATURE OF BUBBLE OR SPIRIT LEVELS.

Technical

PRECISION INSTRUMENT OF SIMPLE DESIGN WHICH PERMITS MEASUREMENT OF SENSITIVITY OF A LEVEL AS EXPRESSED IN SECONDS OF ARC, AND REGULARITY OF CURVATURE OF SPIRIT LEVELS, AS INDICATED BY UNIFORM RUN OF BUBBLE. TRIER'S DESIGN PERMITS TESTING OF SPIRIT LEVELS ALONE, OR AS MOUNTED ON AN INSTRUMENT. FEATURES AUXILLARY SCREW ON BASE, ENABLING TRIER TO TEST LEVELS OF HIGHEST GRADE OF PRECISION, IN REPETITION TESTING.

Area Notes

Unknown

Details

Markings

.1 ADJUSTMENT KNOB GRADUATED 0-49 BY SINGLE DIVISIONS; LEVEL TUBE DIVIDED BUT NO SCALE/.2 'C.L. Berger & Sons/ Boston, U.S.A.' INCISED ON MICROMETER HEAD; GRADUATED 0-90, IN BOTH DIRECTIONS, BY SINGLE DIVISIONS. REFERENCE POST DIVIDED 0-35 IN INCREMENTS OF 5/.3 CASE. DECAL INSIDE COVER INCOMPLETE; READS: 'MAN[UFACTUR]ED BY/ R.A. [.__R]OULE/ O[TTA]WA.'

Missing

EXTENSION Y-SUPPORT BRACKET

Finish

.1-.2 DARK GREEN ENAMELLED FINISH/ BLACK PAINTED BORDER. SOME PARTS HAVE BRIGHT LACQUERED FINISH.

Decoration

N/A