Chauncey Jerome “Union” One-Day Shelf Clock, 1850s

This small shelf clock called the “Union” was made by Chauncey Jerome in New Haven, Connecticut in the 1850s. It is illustrated in Jerome’s 1852 and 1853 clock catalogs.

The one-day time and strike spring-driven movement is stamped “C. Jerome / New Haven Conn / USA”. The label on the rear of the case says “CHAUNCEY JEROME / MANUFACTURER OF / EIGHT AND ONE DAY / BRASS CLOCKS / TIMEPIECES AND MARINE LEVERS / New Haven, Conn. / AMERICA”

The case is 13 9/16 inches tall and 10 1/8 inches wide at the base. The dial time track is 5 inches in diameter. The minute hand is not original (but appears to be a very old replacement), the original was a small spade matching the hour hand.

The dial had been poorly touched up in the past, so I had it repainted as close to original as possible by The Dial House. I cleaned the movement, polished the pivots, installed 8 bushings, straightened 3 teeth and replaced one tooth in the strike second wheel, polished the pallets, and made a new verge retainer.

The movie below shows the movement of the clock and shows the hour striking in operation:

Below is a slide show of more photos:

I installed two new mainsprings, 5/16 x 0.0137 x 45 inches (part number PM-CS510 from The P.M. Company). These springs are thin to reduce wear in the movement, but will power the clock for 3 – 4 days on a winding. The movie below shows the escapement motion:

The movement plates are 1.9 mm thick. Later Connecticut clocks have thinner plates. For example, a Seth Thomas No. 89 movement I measured has 1.4  mm thick plates, and a 1920s Ingraham movement has 1.25 mm thick plates.

Repair job 5081.

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