Demagnetizer
A machine or tool used to remove magnetism from parts of watches. There are several demagnetizers upon the market. In some of these machines the arc and incandescent electric light wires are attached to generate the magnetism, while in the Ide demagnetizer it is generated by the use of horseshoe magnets.
The Greaves demagnetizer, shown in Fig. 105, is intended to be used either with a battery or electric light wire.
Fig. 106 shows the Berlin Demagnetizer; it is constructed on a principle similar to the Greaves, and like it, gives the best results when used with electric light wires. Procure an attachment plug and fasten to the end of the flexible cord accompanying machine. Insert a lamp receptacle and turn on the current. Press down the key and turn the handle of commutator, about 150 revolutions a minute. Insert the watch or part to be demagnetized into the opening of the magnet, and revolve very slowly, keeping it in a straight line with the center of the magnet until at a distance of two or three feet. Keep turning commutator at regular speed. Release key before ceasing to turn. It is not necessary to remove the movement from the case nor to let it remain in the magnet. While the current is on and the handle being turned with key down, insert the watch into the opening and proceed as above. DENISON, E. B. A barrister of London, who was requested by the government to draw up, in conjunction with the Astronomer-Royal, specifications for the construction of a large clock for the Victoria Tower of the Houses of