- Feb 10, 2001
I recently completed repair on an Ingraham 8 Day alarm clock. The clock is running briskly; the lever escapement action looks perfect. However, the clock is losing 20 minutes per day. Does anyone have an idea what my BPH target is? According to Tran's Ingraham reference, my movement looks similar to the 30 hour 2-Spring Alarm Model B, but she runs for a full week between windings. There's nothing in my "Clockmaker's Beat Book" and there are no markings identifying the movement, so short of tearing the movement apart again to count pinions and leaves, I have no idea what my target BPH should be. The attached photo shows the rate lever shoved as far as it can go to increase the rate. It currently measures 16,172 BPH. Any ideas on what the beat rate should be? Many thanks!