| Sargent & Greenleaf Type L Time Lock Movement | |
| Written by AnubisTTP on 2012-07-25 |
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Sargent & Greenleaf is a prolific manufacturer of time locks and time lock components, and the Type L movement is a typical example of the type of movements used in older Sargent & Greenleaf time locks. Unlike most manufacturers of this era, which used movements manufactured by the E. Howard watch company, Sargent & Greenleaf constructed their own movements in-house. As a result, Sargent & Greenleaf time lock movements contain many distinctive design choices, such as a characteristic 'wagon wheel'-style dial and an unusual jeweled escapement that does not include a roller gem on the balance wheel. These movements were designed to be used in groups for redundancy; typically two or three movements would be installed in a single time lock. Sargent & Greenleaf made both brass and nickel plated versions of this time lock movement, which are functionally identical other than the choice of metal used in their construction. We have been unable to accurately date this item, but suspect it was manufactured sometime between 1890 and 1920.
Sargent & Greenleaf Type "L" time lock movement, nickel plated variant.
Sargent & Greenleaf Type "L" time lock movement, brass variant.
Sargent & Greenleaf Type "L" time lock movement, view of escapement.
This Sargent and Greenleaf time lock makes use of Type L movements.
Three type L movements provide redundancy in case of mechanical failure.
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