General Information

Serial #

N/A

Part Number

4

Total Parts

6

AKA

N/A

Patents

N/A

General Description

ALL METAL CONSTRUCTION (INCLUDING BRASS)

Dimensions

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

Length

15.0 cm

Width

15.0 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Demonstration & teaching equipment

Sub-Category

N/A

Manufacturer

AKA

Koenig

Country

France

State/Province

Unknown

City

Paris

Context

Country

Canada

State/Province

Ontario

Period

THESE INSTRUMENTS PROBABLY USED 1890S+.

Canada

PART OF A COLLECTION OF PHYSICS LABORATORY AND CLASSROOM DEMONSTRATION APPARATUS FROM MCMASTER UNIVERSITY. FOUNDED IN 1887, MCMASTER WAS ORIGINALLY A BAPTISTINSTITUTION, AND WAS LOCATED IN TORONTO. IN 1930 THE UNIVERSITY AND ITS STUDENT POPULATION OF 500 WAS MOVED TO HAMILTON, ON. (REF. 1)

Function

TO DEMONSTRATE GRAPHICALLY THE PATTERN OF STANDING ACOUSTIC WAVES.

Technical

CONCEPT ORIGINATED IN 1787 BY GERMAN SCIENTIST AND AMATEUR MUSICIAN ERNST CHLADNI. SAND OR LYCOPODIUM POWDER SPRINKLED ON PLATE WOULD FORM PATTERNS ALONG THE NODAL LINES OF VIBRATION WHEN A VIOLIN BOW WAS DRAWN ACROSS THE PLATE EDGE. THE INDIVIDUAL PATTERN WAS DETERMINED BY WHERE ALONG THE PLATE EDGE THE BOW WAS APPLIED, WHERE THE SAND OR CORK WAS DEPOSITED, AND BY THE SHAPE OF THE PLATE OR DISK. (REF. 1 & 2)

Area Notes

Unknown

Details

Markings

" RK " incised in script in one corner/along edge of each plate, on underside

Missing

From CA of 11/29/2001 by Matthew Bruce: Yes - missing mounting bolt used to attach plates to base

Finish

TOP SURFACE OF PLATE HAS DARKENED FINISH

Decoration

N/A