General Information

Serial #

870

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

CAST IRON BASE & FRAME ASSEMBLY. BRONZE BEARINGS IN CAST IRON BEARING BLOCKS. INSULATED COPPER FIELD COILS WITH LAMINATED STEEL POLES. INSULATED COPPER ARMATURE WINDINGS OVER LAMINATED STEEL CORE WITH COPPER, MICA INSULATED COMMUTATOR. CAST IRON BRUSH SUPPORT WEB, BRASS BRUSH SUPPORT SHAFTS; CARBON BRUSHES WITH BRASS SPRINGS. BRUSH HOLDERS ARE PROBABLY AN ASBESTOS BASED MOLDED ASSEMBLY WITH INSULATED HARDWARE. CAST IRON SPEED CONTROL WHEEL. STEEL GEARS & SHAFTS.

Dimensions

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

Length

90.0 cm

Width

84.0 cm

Height

93.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Energy-electric

Category

Conversion

Sub-Category

N/A

Manufacturer

AKA

STOW

Country

United States of America

State/Province

New York

City

Binghamton

Context

Country

United States of America

State/Province

Unknown

Period

THIS TYPE OF MOTOR USED C.LATE 1890S-1930.

Canada

PART OF A LARGE AND VARIED COLLECTION OF ELECTRICAL ITEMS ACQUIRED & DOCUMENTED BY ONTARIO HYDRO IN THE 1960S. THIS COLLECTION CONSISTS OF OVER 7500 ARTIFACTS, AND IS THOUGHT TO BE THE LARGEST & MOST COMPREHENSIVE IN CANADA. IT WAS DONATED IN ITS ENTIRETY TO THE NATIONAL MUSEUM OF SCIENCE & TECHNOLOGY IN 1992.

Function

TO CONVERT DIRECT CURRENT ELECTRICAL ENERGY INTO ROTARY MECHANICAL ENERGY.

Technical

MULTI-SPEED MOTOR PERMITTED VARIATION OF SPEED (BETWEEN EST'D MINIMUM & MAXIMUM LIMITS) BY SIMPLY TURNING SMALL HANDWHEEL ON TOP OF MOTOR. THE SPEED OF THE MACHINE IS VARIED BY CHANGING THE INTENSITY OF THE FIELD MAGNETISM. EFFICIENCY REMAINED NEARLY UNIFORM REGARDLESS OF SPEED; HP REMAINED UNCHANGED; NO SPARKING AT THE COMMUTATOR RESULTED BECAUSE MAGNETIC STRENGTH WAS MAINTAINED AT THE POLE TIPS (REF.2). THIS DESIGN PROVED SIGNIFICANT IN THE DEVELOPMENT OF VARIABLE SPEED ELECTRIC MOTORS USED FOR DIRECT DRIVE OF INDIVIDUAL MACHINES.

Area Notes

Unknown

Details

Markings

MFR'S PLATE SCREWED TO CASING READS: 'STOW MFG. CO./ BINGHAMTON, N.Y. U.S.A./ No 870/ 220 VOLTS 8 A.P. 710/ 1565 R.P.M.'/ 'STOW M'F'G CO.' CAST IN RAISED PRINT ON ONE SIDE OF CASING; 'BINGHAMTON, N.Y.' CAST IN RAISED PRINT ON OPPOSITE SIDE/ EACH OF 4 MAGNET BUNDLES NUMBERED: [CLOCKWISE, FROM TOP]: '705', '678', '[ILLEGIBLE]', '670'/ SECOND PLATE SCREWED TO CASING READS: 'MULTISPEED MOTOR/ PATENTED JAN. 18 1898/ IN UNITED STATES/ GREAT BRITAIN & FRANCE/ OTHER COUNTRIES PENDING.'/ DECAL APPLIED TO CASING TOP READS: 'PROPERTY OF/ STATE UNIVERSITY OF IOWA/ EEM 862 L7'/ '1112 C.C. [ILLEGIBLE TEXT] STAMPED ON SHAFT END.

Missing

VARIOUS PIECES OF ELECTRICAL POWER HARDWARE MISSING. FIELD COILS, BRUSHES & POWER JUMPERS NOT CONNECTED.

Finish

MOTOR CASE & BASE HAVE BLACK GLOSSENAMEL FINISH. FIELD & ARMATURE WINDINGS TAPED, VARNISHED & PAINTED BLACK. NATURAL FINISH ON ARMATURE SHAFT & PULLEYS

Decoration

N/A