Osmon, a new fuel, is made from peat. The peat used contains 90 per cent of water, of which 20 to 25 per cent is removed by means of an electric current. The peat is then further dried and passed through a machine which breaks it up and forms it into brin-quettes, or nut shaped pieces.

The Goodell-Pratt Co., Greenfield, Mass., have long been known to the trade as manufacturers of labor saving tools of the highest grade. The tool set advertised in this issue is but one of the many tools which the amateur mechanic or eleetrician will find useful in his work. The catalogue of this company, which may be obtained upon request, shows hand and bench drills, chucks, bit braces, gimlet bits, and many other tools.

The most effectual means for the removal of bolts that have rusted in, without breaking them, is the lib-eral application of petroleum. Care must be taken that the petroleum shall reach the rusted parts, and some time must be allowed to give it a chance to penetrate beneath and soften the layer of rust before the attempt to remove the bolt is made. Bolts and studs on which the nuts are fixed with rust are often broken off through impatience. In most cases a small funnel built round a stud or bolt end on the nut with a little clay and partly filled with any of the searching petroleum oils, and left for a few hours, will enable the bolt or nut to be moved.

The English newspapers report a new application in Australia of the principle of the eoin-in-the-slot machine, stating that if a stamp cannot be purchased conveniently it will be possible in the future to drop a letter into the orifice of a postal box and a penny into a second orifice, and the words "one penny paid " will be found impressed on the envelope when the box is opened by the post-office authorities, thereby securing the transmission of the letter.

The Grand Trunk Railway Company will substitute electricity for steam in the Sarnia tunnel, and will install a plant for that purpose to cost $500,000. The third-rail system will be used.

An excellent lubricant for drills and metal cutting tools in general can be made by mixing turpentine with machine or lard oil in equal proportions. The turpentine causes the tool to cut very keenly.

An ingenious suggestion was made recently by Major G. O. Squier, of the signal corps of the United States army, which, if it proves practicable, will be of great service to the signal corps. Major Squier says that as a living organism may form a part of an electrical circuit, it is possible to utilize a tree as the aerial of a wireless telegraph system. Connections should be made near the ground and where the branches be gin to spread, by the simple method of driving in two iron nails to which the receiving device is attached. If the plan works well in practice there will always be suitable aerials for army use, except in a very barren country. Probably a tree is not as efficient as a metallic wire properly suspended, but as the distances to be covered in army signalling will never be great, this is a small matter. A more important point is the deduction that if a tree can be used in this way with good results, it would seem to follow that an intervening forest adds to the difficulty of transmitting messages over land. It may, in some cases, make the operation of a wireless system, under such conditions, practically impossible. - Elec. Review,