GLOW PLUGS FOR DIESELS
Page 90
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AGLOW plug for starting diesel engines forms the subject of patent No. 859,659. Simplicity of manufacture coupled with adequate protection for the filament are the chief claims made for the design. (Robert Bosch G.m.b.H„
. 4 Breitscheidstrasse, Stuttgart-W., Germany.) The drawing shows the inner sleeve carrying the filament. A nonscaling metal shell (1) contains the helical filament which is wound on several ceramic cores (2) the diameter of which increases towards the tip.
The interVening space is packed tightly with ceramic powder; the degree of tightness is important because it has a considerable effect on the thermal conductivity of the powder. The filament end is welded to a central electrode (3) and earthed at the bottom on a metal plug (4).
The increasing length of filament towards the tip gives increasing emperature at this end and the metal plug is made to glow. The turn-to-turn pitch of the filament should not be in excess of 0.024 in.
MORE LOAD, MORE WHEELS
A N INTERESTING scheme for 1-1 transporting heavy machinery weighing 100 tons or more is disclosed in patent No. 859,289. (M. Pratolongo, Milan, Italy, and C. Kean, 6 Stratton Street, London, WA.)
The chief novelty is that detachable bogies, each capable of carrying 20 tons, are held "in stock.' Any number of these can be assembled on a chassis frame according to the load to be carried.
The bogies have hydraulic cylinders as a means of suspension, and all the cylinders in an assembly are connected by pipevvork, thus creating a fully compensated suspension that can deal with rough terrain if necessary. The hydraulic cylinders can also be pumped up or down when it is desired to vary the ground clearance.
The drawing herewith, one of 25 in the specification, shows some typical
assemblies. All the bogies are dirigible and the right-hand drawing shows their position in negotiating a curve.
The rest of the drawings are very informative, showing the actual constructional details of all the component parts.
IMPROVEMENTS IN TWO-STROKES
ECONOMY in fuel and lubricating .1-1 oil and increased efficiency are claimed for a two-stroke engine shown in patent No. 859,487. (F. Sti1mpfig, 31 Bismarckstrasse, Nurnberg, Germany.)
Referring to the drawing, when the piston is at td.c., air is drawn into the crankcase via a port (1) on the side. Simultaneously, another port (2) in the piston lines up with an intake port (3) in the cylinder wall. This supplies a and the mixture are both compressed, but still remain substantially separate_ At the bottom of the stroke, two transfer ports are opened, one (5) for the air and another (6) for the rich mixture. The air performs most of the scavenging (as shown at 7), while the mixture follows the dotted-line path (8) up the cylinder wall and into the to combustion space. Final mixing of the fuel and air takes place only after commencement ol ignition.
It is said that lowgrade fuel can be successfully used in the engine, and that a higher crankcase com. pression is possible The -latter will give im.
proved scavenging which will result in an increase in efficiency.
POWERED PORTABLE BUILDING
PATENT No. 860,455 describes vehicle that can be regarded as portable building. The front powerec unit is connected with the trailing reai wheels only by a tall overhead gantry From the gantry can be suspended walls partitions and suchlike members. Sug. gested uses are temporary workshops milking sheds or shops. The patent come' from J. Jacottet, Eure et Loir, Bonneval Trance.