Books › The Boston directory. [1892], 1892 › scan 4
Scan 4
The Boston directory. [1892], 1892
34 lines. Read by computer on 17 September 2026. No printed page number was found. See the scan on archive.org.
1ELECTRICAL SAFETY CO.
3This Company is sole owner of Letters Patent of the United States, issued to David J. Cartwright for the Protection of Electrical Instruments, and owns and controls other devices for protecting fire alarm circuits from abnormal currents, thus enabling an alarm of fire to be "rung in" from any box on a circuit whether crossed by a weak or strong abnormal current.
5The Cartwright Protector is simple, unfailing in action and automatic; it gives perfect protection against lightning; arc, incandescent, or power wires, which may come in contact with the line upon which it is placed.
7At a recent test made under the auspices of the Boston Fire Underwriters' Union, it was the only protector which fulfilled all the requirements of the test, and was adopted by the Board.
9Unlike many so called protectors, the Cartwright Protector has no contact points in the normal circuit, and will protect any instrument from an abnormal current of any capacity from .043 to 30. amperes.
11In using the Cartwright Protector on a fire alarm circuit in connection with a Safety Cut Out (Patented Dec. 2, 1890), issued to David J. Cartwright and now owned by this Company, a current of 30 amperes can safely be taken care of without opening the circuit; should the current exceed 30 amperes, an automatic device in cut-out box will make that section of the circuit crossed by the electric light or power wire dead, ground the two boxes each side of cross, and leaves the fire alarm circuit in a condition to respond in case of fire, from all boxes on the circuit.
13BOSTON BOARD OF FIRE UNDERWRITERS, 55 KILBY ST., BOSTON, April 21, 1890.
14ELECTRICAL SAFETY COMPANY, GENTLEMEN:—In reply to your favor of this date, permit me to say that the Cartwright Electrical Protector submitted by your company at the recent test of Electrical Safety Devices made by the Boston Fire Underwriters' Union is reported to us as having met in a satisfactory manner all the conditions of the test, and the use of the said Protector will be approved by our Inspectors. I am, yours truly, OSBORNE HOWES, JR., Secretary.
16CAPT. WILLIAM BROPHY, of the New England Insurance Exchange, was present at the tests and joined in the endorsement of the Cartwright Protector.
18The same have been adopted and are in use by the following cities, viz:
19BOSTON, CHELSEA, MALDEN, SOMERVILLE, WALTHAM and HOLYOKE.
20Recommended by the GAMEWELL FIRE ALARM TELEGRAPH CO., Boston, Mass.
22[A TRUE COPY.]
24BOSTON, Feb. 8th, 1892.
25ELECTRICAL SAFETY COMPANY, GENTLEMEN:—It gives me great pleasure to report to you that on this day we proved the efficiency of your Electric Protector in saving our repeater from a cross with a 1000 volt alternating circuit.
26Our fire alarm circuit had a ground on it, and when in this condition it was crossed with the alternating primary circuit of the Malden Electric Light Co., Malden, Mass.
27This current remained on the wire several minutes, and would have destroyed our repeater had it not been for the protector. When the trouble was removed, the protectors automatically resumed their normal position. I consider your protectors the best I have seen, and cheerfully recommend them to others who wish to protect their fire alarm or their electrical instruments.
28Yours respectfully, H. A. MORSE, Supt. Electric Liner, Electrician of City of Malden.
30A complete demonstration of the invention in practical operation can be seen at our place of business, where we shall be pleased to see all who are interested.
32OFFICE, 146 FRANKLIN ST.
33Room 21. Take Elevator. Boston, Mass.
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