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History of Seth Thomas Antique Thirty
Hour Brass Weight Driven Movements
For photos and more information, see:
“The Nobel Jerome Patent 30-Hour
Brass Weight Movement and Related Movements”, by Snowden Taylor, Bulletin
of the National Association of Watch and Clock Collectors, Inc., Whole Number
211, Part II, December 1982.
| Movement
Type (from Snowden Taylor article mentioned above) |
Distinguishing Features |
| 1.243 |
Diagonal cut on escape wheel cock (later movements
have no cut). Brass hammer with crescent shaped cutout. Deep teeth on
count wheel. Wide rim on count wheel and time mainwheel. No name on
movement. |
| 1.241, early |
Brass hammer with crescent shaped cutout. Deep
teeth on count wheel. Wide rim on count wheel and time mainwheel. Count
lever has inserted eyelet for trip wire (on later movements the count
lever is bent to form an eyelet). |
| 1.241, middle |
Medium depth teeth on count wheel. Zinc hammer
(early) or round brass hammer. |
| 1.241, later |
Shallow teeth on count wheel (only a triangle
portion projecting above the rim). Round brass hammer. |
| |
Transition movement, has pinned plates like
1.241, but plate is shaped like 1.242 (i.e., it has the projection by
the time second wheel pivot). |
| 1.242 |
Screws on pillar posts (earlier movements use
pins to hold on front plate). Semi-circular projection on plates by
time second wheel pivot. |
| 1.8 |
Trip wire on tail (earlier movements have trip
wire on count lever). Semi-circular projection on plates by time second
wheel pivot. |
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| Movement
1.243: Diagonal cut on escape wheel cock (later movements have
no cut). Brass hammer with crescent shaped cutout. Deep teeth on count
wheel. Wide rim on count wheel and time mainwheel. No name on movement.
Courtesy of Richard C. Tjarks. |
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| 1.241,
early: Brass hammer with crescent shaped cutout. Deep teeth on
count wheel. Wide rim on count wheel and time mainwheel. Count lever
has inserted eyelet for trip wire (on later movements the count lever
is bent to form an eyelet). |
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