JOHN W FORREST
Engineering in Acton, MA
License number
Massachusetts 13512
Expiration Date
Jun 30, 1984
Type
Mechanical Engineer
Address
Address
Acton, MA 01720
Professional information
Adaptable Connector For A Fiber Optic Testing Device
US Patent:
4413880, Nov 8, 1983
Filed:
Jan 2, 1981
Appl. No.:
6/222189
Inventors:
John W. Forrest - Acton MA
Thomas DeFusco - Worcester MA
Thomas DeFusco - Worcester MA
Assignee:
Bowmar/ALI, Inc. - Acton MA
International Classification:
G02B 726
US Classification:
350 9620
Abstract:
A connector is provided for connecting unterminated optical fiber cables to test sets or the like. The connector has a cable adapter section and an optical fiber adapter section. The cable adapter section is partly slotted and has a cylindrical bore for receiving the cable. The outer dimensions of the cable adapter section cooperate with a sliding ring to form a clamp for holding the cable securely. The optical fiber adapter section has a cylindrical bore coaxially aligned with the bore of the cable adapter section and receives the unsheathed optical fiber and maintains it in precise optical alignment within the test set. Disposed between the cable adapter section and the fiber adapter section is a conical chamber for guiding the optical fiber to the bore of the fiber adapter section.
Fiber Optic Attenuation Simulator
US Patent:
4281925, Aug 4, 1981
Filed:
Jul 31, 1979
Appl. No.:
6/062594
Inventors:
John W. Forrest - West Acton MA
Robert D. Livingstone - Townsend MA
Robert D. Livingstone - Townsend MA
Assignee:
Bowmar/Ali, Inc. - Acton MA
International Classification:
G01N 2184
US Classification:
356 731
Abstract:
A fiber optic line simulator simulates the attenuation in a fiber optic cable with repeatable accuracy by adjusting the air spacing between the ends of two foreshortened fiber optic cables adapted to be connected to a continuity meter or other device for measuring attenuation in a fiber optic cable of extensive length. The simulator may also simulate specific fiber optic lengths for use in evaluation of optical communication systems.
Instrument Housing
US Patent:
4186386, Jan 29, 1980
Filed:
Jan 10, 1978
Appl. No.:
5/868417
Inventors:
John W. Forrest - West Acton MA
Assignee:
Bowmar/Ali, Inc. - Acton MA
International Classification:
H02B 108, G08B 500
US Classification:
340366R
Abstract:
A segmented housing for electrical instrumentation particularly panel mounted meters of the electro-optical readout variety. The housing is formed in first and second halves separating the housing into substantially similar upper and lower portions which are secured together and to a panel mounting bracket by recessed bolts on opposite sides. The brackets are located in side channels extending a substantial portion of the housing side length to provide a highly rigid and secure attachment. The housing halves are apertured in the rear to permit electrical connection through lugs to a circuit board within. The front halves are apertured and beveled for panel mounting with a molding surrounding the aperture through which an indicator scale is visible. One or more lens elements provides scale indication and/or scale magnification. The housing resulting from the securing of the two halves together forms a trim, flat package such that a plurality of the units may be closely stacked for high density display applications.