General Information

Serial #

N/A

Part Number

1

Total Parts

4

AKA

N/A

Patents

N/A

General Description

.1-.2 METAL BASE & ELECTRODE, COPPER WASHER, PORCELAIN INSULATOR/.3-.4 CARDBOARD

Dimensions

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

Length

17.0 cm

Width

8.0 cm

Height

7.2 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Motorized Ground Transportation

Category

Automotive engineering

Sub-Category

N/A

Manufacturer

AKA

AC Spark Plug

Country

Canada

State/Province

Ontario

City

St. Catharines

Context

Country

Canada

State/Province

Ontario

Period

C. 1932

Canada

FROM COLLECTION OF AUTOMOBILE PTS & SERVICING EQ ACQUIRED BY MR. T.H. OLIVER, FATHER OF DONOR, DURING CAREER IN AUTOMOTIVE SERVICING. AFTER WORKING AT WILLYS-OVERLAND & FAIRBANKS-MORSE IN TORONTO, & IN AUTO GARAGE IN AURORA, IN 1931 HE BEGAN HIS OWN BUSINESS, ONE PART OF WHICH INVOLVED AUTOMOTIVE ELECTRICAL SERVICING.

Function

PART OF IGNITION SYSTEM OF INTERNAL COMBUSTION ENGINE; SPARK PLUG IS FITTED INTO CYLINDER OF ENGINE TO PROVIDE PAIR OF ELECTRODES BETWEEN WHICH IS PASSED ELECTRICAL DISCHARGE OR SPARK WHICH IGNITES MIXTURE OF GASOLINE VAPOUR & AIR.

Technical

UNUSUAL SPARK PLUG WITH TWIN ELECTRODES, IN WHICH RESISTANCE TO SPARK WAS SIGNIFICANTLY HIGHER THAN IN EARLIER LOW TENSION, LOW COMPRESSION ENGINES. MFRS. WERE SEEKING CONFIGURATION WHICH WOULD PERFORM WITH INCREASINGLY HIGH COMPRESSION ENGINES AS WELL AS IN HIGH TENSION IGNITION SYSTEMS; TWIN GAP WAS ONE SOLUTION (REF. 1)

Area Notes

Unknown

Details

Markings

.1-.2 BLUE LETTERING ON PORCELAIN READING "AC" & "75"; INCISED LETTERING A.C. SPARK PLUG MADE IN CANADA"/.3-.3 ORANGE, WHITE & BLACK LETTERING ON BOX END READING "AC/ BLUE TOP/ SPARK PLUG/ MADE IN CANADA/ 75"& ON SIDES "AC/ SPARK/ PLUG/ PRINTED IN CANADA/ A.C. SPARK LUG COMPANY ST. CATHERINES, ONTARIO" & "AC/ BLUE/ TOP" WITH PATENT INFO.

Missing

.1 MISSING BOX

Finish

.1-.2 DARK GREY BASE, WHITE PORCELAIN, BRASS COLOURED END PIECE, COPPER COLOURED WASHER/.3-.4 ORANGE & NAVY BLUE

Decoration

.1-.2 BLUE STRIPE ON PORCELAIN/.3-.4 ORANGE & WHITE STRIPES