General Information

Serial #

N/A

Part Number

1

Total Parts

10

AKA

N/A

Patents

N/A

General Description

.1-.10 METAL, POSSIBLY STAINLESS STEEL, CASING; GLASS SCALE. WOODEN CASE IS FABRIC LINED; FITTED WITH BRASS HINGES & HOOK CLOSURE. METAL CLAMPING SCREW POSSIBLY STAINLESS STEEL

Dimensions

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

Length

22.3 cm

Width

21.5 cm

Height

4.7 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Metrology

Category

Length

Sub-Category

N/A

Manufacturer

AKA

Williamson

Country

England

State/Province

Unknown

City

London

Context

Country

Canada

State/Province

Ontario

Period

THESE RULES PROBABLY USED C.1950S-1970S, AND POSSIBLY LATER.

Canada

Unknown

Function

USED WITH PHOTOGRAMMETRIC TRACING TABLE TO ADJUST & DETERMINE RELATIVE HEIGHT OF THE PLATEN, BY MEANS OF HIGH MAGNIFICATION PROJECTION.

Technical

EXAMPLE OF PRECISE GLASS RULES DESIGNED FOR USE WITH PHOTOGRAMMETRIC TRACING TABLES. THE GLASS SCALES ARE INTERCHANGEABLE: THEY WERE MFD. TO READ DIRECT IN FEET OR METRES AT STANDARD MAP SCALES, OR COULD BE ENGRAVED TO SPEC. WILLIAMSON ADVERTISED THEIRS AS GRADUATED TO 0.10 MM TO AN ACCURACY OF 0.001 MM WITH A RANGE OF 100 MM. TRACING TABLES USING GLASS SCALES COULD BE USED WITH ANY DIRECT ANAGLYPHIC PROJ.EQ.

Area Notes

Unknown

Details

Markings

.1-.3 'SCALE.E.1-31,680 IN FEET.' & 'E' STAMPED ON CASING/.4 'SCALE.F.1-16,667 IN FEET' & 'F' STAMPED ON CASING/.5 'SCALE.G.1-20,000 IN FEET' & 'G' STAMPED ON CASING/.6 'SCALE C.1-10,000 IN 5 FT INTERVALS'. & 'C' STAMPED ON CASING/.7-.10 'SCALE METRIC' STAMPED ON CASING. '565' CRUDELY INCISED IN ENDPIECE OF.7 '495' CRUDELY INCISED ON CASING NEAR ADJUSTMENT SCREW ON.9

Missing

NONE- RULES ARE COMPLETE IN THEMSELVES. .10 ADJUSTMENT SCREW IS BENT/DAMAGED

Finish

BRUSHED SILVER FINISH ON RULE, CASING; ADJUSTMENT SCREW ON EACH RULE HAS BLACK FINISH. LIGHT BROWN WOOD CASE LINED WITH PURPLE FABRIC.

Decoration

N/A