The case is 24 inches high by 18 inches wide. Depth is 13 inches. It weighs about 80 pounds. (The backboard that the instruments and switches are mounted to is a 1 inch thick slab of marble!)

Upper name plate...

Bottom name plate. Patent dates run from 1910 to 1916.

An inside view of the center of the control panel. The dial in the lower middle allows the bank to set the time that the alarm will run in the case of a break-in. Up to one hour is possible. The timer movement is in the upper center. The main electrical switch is in the upper right. The "Alarm Test" pushbutton in the upper left allows the alarm to be tested without actually setting off the alarm. There is one amp meter for "dry" batteries and one for "wet" batteries.

Top set of knife switches allowing various functions to be set. Note the "Hold Up" switch on the right!

The main switch...

One of the amp meters...

The case opens like a clamshell exposing the wiring on the back of the marble slab and the alarm timer box.

A close-up of the wiring...

The alarm timer box. Inside this box is a Seth Thomas #10 clock movement. When triggered, it runs for the amount of time previously set on the front dial and allows power to go to the alarm.

The "heart" of the system. The winding square is just below the dial. It runs for up to 120 hours as indicated on the dial.

The Illinois 15 Jewel movement. In the place of the mainspring barrel, there is a heavy steel gear which engages the large brass mainspring gear (see movement housing photos below).

Pillar plate...

A mainspring that's just a bit bigger than your average watch mainspring. It sits below the movement. (See the movement block photo below.) The spring is so powerful that the Illinois movement will self-start with only 1/4 turn of the winding key.

The solid steel block that houses the Illinois movement and mainspring.

The front of the movement block showing the electrical contacts. The "Hold to Left While Winding" lever has a piece of insulating material at the top that isolates the electrical contacts while the movement is being wound.

Another view of the movement block. Note that the 4 mounting screws do not screw down tight and have springs around them to isolate the movement from vibration.

Dial close-up...

The plate behind the timer block.

When I bought the timer, this envelope from the Provident Savings Bank and Trust Co. in Cincinnati, Ohio was inside.

It contained these handwritten instructions on setting the alarm system.
