This table is a compilation of information culled from the Inspection Reports available from the National Archives for lighthouses where a clockwork mechanism was used to activate a screen, belt, or panels to produce a flashing pattern. The table includes the following categories of information: Lighthouse name; Year of report; Order of lens; Type of device used to produce a flash; Pounds of weight used for powering the clockwork mechanism; Time of one cycle; Length of Drop Tube (if any); Time between windings; and whether the device turned on ball bearings or chariot wheels. In many of the reports, data was simply not included for all of the categories, but the extracted information nonetheless gives a heretofore underappreciated glimpse into this aspect of lighthouse operation.
Please note this list is not complete as it is based on available Inspection Reports, which do not cover all lighthouses and time periods.
| LIGHTHOUSE | YEAR | ORDER | TYPE | POUNDS | TIME | DROP TUBE FT. | WIND TIME HR. | BB CW |
|---|---|---|---|---|---|---|---|---|
| Makapuu HI | 1916, 27 | 0 | Revolving screen inside lens | 121 | no tube | 3.5 | BB | |
| Currituck Beach NC | 1909 | 1 | Revolving belt | 4.5 M | 2.5 | CW | ||
| Sand Key FL | 1913 | 1 | Revolving belt | 8 M | 9 | 3.5 | BB | |
| St. Augustine FL | 1911 | 1 | Revolving belt | 270 | 9 M | 1st landing to pit | 2.75 | CW |
| Grosse Point IL | 1910 | 2 | Revolving belt | 9 M | 68 | 8 | CW | |
| Petit Manan ME | 1935 | 2 | Revolving belt | 250 | 6 M | 22 | 5.5 | CW |
| Big Bay Point MI | 1910 | 3 | Revolving panels | 80 s | Full tower and into basement | 5 | CW | |
| Brandywine Shoal DE | 1914 | 3 | Brass sleeve | 30 s | 69 | 4 | ||
| Cape San Juan PR | 1912 | 3 | Revolving belt | 254 | 9 M | 27 | 4 | CW |
| Dunkirk NY | 1909 | 3 | Revolving panels | 2.25 M | 37 | 6 | CW | |
| Fenwick Island DE | 1907 | 3 | Revolving panels | 6 M | 18 | 5 | CW | |
| Fort Gratiot MI | 1912 | 3 | Revolving panels | 4 M | 45 | 3.5 | CW | |
| Isla Caja de Muertos PR | 1918 | 3 | Revolving belt | 200 | 9 M | 42 | 6 | CW |
| Little Sable MI | 1911 | 3 | Revolving belt | 90 | 78 | 11 | CW | |
| Sabine Pass LA | 1858 | 3 | Revolving panels | |||||
| Sanibel Island | 1912 | 3 | Revolving panels | 115 | 6 M | 65 | 4 | BB |
| St. Simons Island GA | 3 | Revolving belt | ||||||
| Princes Bay NY | 1880 | 3.5 | 2 M | 24 | ||||
| Cape Arago OR | 1881 | 4 | Revolving panels | 2 M | 20 | 3 | ||
| Cedar Keys FL | 1912 | 4 | Revolving panels | 75-150 | 2 M | 22 | 4.75 | CW |
| Coquille River OR | 1896 | 4 | Brass cylinder | 30 s | ||||
| Deep Water Point Front Range NJ | 1908 | 4 | half-cylindrical shade | 3 s | 22 | 6.5 | ||
| Delaware Breakwater Front Range DE | 1908 | 4 | Cylindrical shade | 32 | 4.5 | |||
| Eagle Harbor MI | 1910 | 4 | Revolving panels | 2 M | Full length of tower | 6 | CW | |
| Elbow of Cross Ledge NJ | 1910 | 4 | Revolving screen | 30 s | 16 | BB | ||
| Faulkners Island CT | 1873 | 4 | Revolving panels | 90 s | ||||
| Finns Point Range Front NJ | 1908 | 4 | Cylindrical shade | 3 s | 27 | 6.5 | ||
| Fourteen Foot Bank DE | 1910 | 4 | Cylindrical shade | 29 | 6 | |||
| Granite Island MI | 1909 | 4 | Revolving panels | 4.5 M | 28 | CW | ||
| Harbor Beach MI | 1886 | 4 | Revolving panels | 3 M | 15 | 5 | ||
| Listons Front Range DE | 1918 | 4 | Occulting blind | 303 | 36 | 8.83 | ||
| Newcastle Front Range DE | 1907 | 4 | Cylindrical shade | 28 | 6 | |||
| Norwalk Island CT | 1880 | 4 | Revolving panels | 2 M | 28 | 5 | ||
| Reedy Island Front Range DE | 1910 | 4 | Revolving screen | 12 s | 20 | 4.5 | BB | |
| Schooner Ledge Range Front PA | 1907 | 4 | Cloth curtain | 3 s | 20 | 5.5 | ||
| Sherwood Point WI | 1886 | 4 | Revolving panels | 3 M | 22 | |||
| Ship John Shoal NJ | 1910 | 4 | Cylindrical shade | 15 s | 15 | 5 | ||
| Shoalwater Bay WA | 1882 | 4 | Revolving panels | 4 M | 12 | 2.5 | ||
| Smith Island WA | 1882 | 4 | Revolving panels | 3 M | 20 | 4 | ||
| Superior Entry WI | 1915 | 4 | Revolving screen inside lens | 75 | 17 | 4 | BB | |
| Tawas Point MI | 1910 | 4 | Hood occulting device | 56 | 5 | |||
| Waugoshance MI | 1907 | 4 | Revolving panels | 90 s | 45 | 5 | BB | |
| Billingsport Front Range NJ | 1910 | 5 | Brass shade | 3 s | 29 | 7 | ||
| Bird Island MA | 1920 | 5 | Revolving panels | 160 s | CW | |||
| Cat Island MS | 1911 | 5 | Revolving panels | 45 | 3 M | 5 | CW | |
| Cheboygan MI | 1910 | 5 | Revolving panels | 3 M | Full length of tower | 4 | CW | |
| Cherry Island Front Range DE | 1907 | 5 | Cylindrical shade | 8 | 6 | |||
| Crabtree Ledge ME | 1909 | 5 | Revolving belt | 4 M | 40 | 9.42 | CW | |
| Ipswich Range MA | 1931 | 5 | Revolving panels | 150 | 3 M | 27 | 5 | CW |
| Little Rapids Cut MI | 1909 | 5 | Revolving lamp | 30 s | 25 | 4 | BB | |
| Portland Breakwater ME | 1909 | 5 | Revolving panels | 2 M | 14 | 6 | CW | |
| Raspberry Island WI | 1910 | 5 | Revolving panels | 3M | Full length of tower | 4.27 | CW | |
| Tenants Harbor ME | 1908 | 5 | Revolving panels | 2 M | 15 | 7.5 | CW |