A NOVEL SPARKING PLUG.
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A sparking plug of interesting design has recently been brought to our notice. This plug can be removed from the engine without it being necessary to atop the latter, and 'without the use of tools. To enable this to be done, the sparking plug is slightly altered from standard design so that it may fitinto an a,cla,p. ter screwed into the usual sparking plug thread.
The adapter is provided with a hexagon so that it can be screwed into the cylinder with a spanner in the ordinary way. The bore of the adapter has three inward projections, which engage bayonet slots in the plug proper. Once installed, the adapter becomes practically a part of the cylinder and is not. removed. The bayonets on the plug are formed at an angle so that the plug is pressed on to a copper-asbestos gasket contained within the-adapter. The upper end of the plug boss is provided with a large flange of material, non-conducting as regards both electricity and heat. This flange is knurled an its outer edge. To' prevent the plug becoming loose in the adapter, serrations are -formed round the top of the latter, and. a small serrated key on the plug is brought into mesh with the Serrations on the adapter by means of a small looking screw which holds the plug firmly. „ The complete ping will shortly he placed on the market by the Instant() • Ping Co., 307, London Road, Wrestcliffon-Sea, and will be retailed at a price only slightly higher than the cost of a standard plug.