Jefferson Exciting Hour

By Roger Russell

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Catalog number 580-301

This clock is almost identical to the Golden Hour but has a brushed chrome finish. This model appears to have been made for only a short time and in a much smaller quantity than the Golden Hour.

Dimensions are 8-7/8" high and the outside diameter of the dial is 7-7/16". Depth is 4-1/2". Weight is 2.3 lbs. The glass is 3/32" thick.

The clock is powered with an International Register synchronous motor located in the base. The output gear from the motor gearbox has 27 teeth and rotates at 1/6 rpm. It mates with the rim gear that has 270 teeth. This 10:1 reduction results in the glass turning at the required 1/60 rpm, or one revolution per hour.

The picture at the right shows the rear of the hands and the pear shaped counterweight assembly. The minute hand is located at front of the glass and is attached to it by friction so that it can be easily turned to set to the desired minutes. The hour hand and gear assembly are located behind the glass and can turn freely. A shaft attached to the center of the glass has a gear in the counterweight gear assembly. The counterweight always stays in a vertical location and provides a fixed position needed to drive other gears that advance the hour hand as the glass turns.

A small counterweight of metal is attached to the rear portion of the hour hand. It's the same shape and can be seen behind the main counterweight near the bottom of the picture at the right. It serves to hold the hour hand in proper position relative to the minute hand. See my page for information on troubleshooting, restoration and improvements of these clocks.

The ring has raised numerals at 3, 6, 9, and 12 o'clock as well as raised radial lines at the other hours. These are filled with blue paint instead of the radium paint used on many of the early Golden Hour clocks. The hour and minute hand have a blue line along the center.

The date of manufacture is usually stamped inside the base and can be seen by removing the two screws holding the black bottom plate. The date on this clock is 8-16-60, which probably means it was made on August 16, 1960.

Here's a side by side comparison of the Golden Hour and the Exciting Hour. The frame and base casting are almost certainly made of zinc alloy indicated by the metal analysis of the Golden Hour clocks.

In the gold plating process, the parts are first plated with nickel. This provides better adhesion for the gold plating. Although the same primary plating process may have been used for the Exciting Hour, the final plating is not nickel. It is advertised in Jefferson literature as a satin chrome finish.

 

 

 

 

Jefferson picture and text from an advertisement:

Exciting Hour