Passing Comments Auto-ignition will ReT HE engines and, incident suit, in
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Loss of ally, many other parts of Power our ageing vehicles sometimes emit noises which, before the war, might have caused considerable concern. Now, operators cannot pay quite so much attention, unless any particular sound be recognized as being one resulting, from a serious fault. There is a particular symptom, however, which certainly deserves notice. That is. auto-ignition, which, apart from the knocking that it sometimes causes, shows itself by the firing of the engine for a few revolutions after the ignition has been switched. off. The trouble may be due to some part of the combustion chamber, including, perhaps, the sparking-plug points, becoming incandescent, and so firing the new charge of mixture. In its more serious form it causes bad pre-ignition with full firing before the piston reaches the top of its stroke. This results in serious loss of power and excessive overheating. According to the Lodge concern, where the plug ,points are affected, this is usually caused by employing plugs of the wrong type.14, is. more likely,, however, that the engine has accumulated an excessive amount of carbon and that the valves need reseating. DEALING with workshop Organization, Mr. F E. Browning, Cleansing Superin , tendent, Islington, in a paper read before the Institute of Public Cleansing, recently, gave his views on the tools and appliances essentin I to such a shop for a department of medium size. They were : —6-in, gap-bed lathe and accessories, including electric, grinding attachment; power hacksaw; tool grinder with 14-in. by 2 in. wheel; small twowheel electric grinder; sensitive pillar drill up to in. and, if possible, large drilling machine of the radial type; geared arbor press; brazing hearth; at least one engine stand, paraffin cleaning tank with filter and pump; riveting machine for brake facings; acetylene welding and cutting outfit; small surface table; electric hand drill up to in., and small pistol type up to I in.; electric-insulation tester; expanding and aolid reamers; a good voltmeter and ammeter will also be found useful. Such equipment would .permit Most repair and service operations to be carried nut although, of course, not work more Suitable ;",:4or specialists. Mr. Browning did not enumerate. tii-Ose snAller tools which would suggest themselves in
practice. •
Should Method of -F-TIE promise by 'Sir John Vehicle Taxation be 1 Anderson, Chancellor of the
Changed ? . • . Exchequer, that he will pay sympathetic attention to representations made concerning motor taxation, is 'certainly encouraging, but probably refers more to the horse-power tax on cars than to the method used in connection with commercial vehicles. There are.various views regarding changes in the system . employed for goods vehicles, but there are few who believe that for these taxation on unladen weight is the most satisfactory. If the `` plating " system for limiting loading be adopted, then it would seem that taxation on carrying capacity might be more advisable. This would in a way bring the method into line with that employed for public-service vehicles, although in neither case, without at least a small tax on fuel, would " usage " become a factor.
THERE is a factory fire in 1 London 'every two hours, and these are distinct from any caused by enemy action. Out of 10,406 outbreaks to which the N.F.S. was called last year in the London region alone,4,182 occurred in industrial premises; the, others were of domestic origin. Of London's fires in 1943, 80 per cent. could have been prevented, whilst carelessness in various forms was responsible for 45 per cent. Careless smoking tops the record with 2,598; defective flues comes next with 1,747; children playing with fire, sparks from railway engines and electrical defects accounted for 630, 629 and 624, respectively; overheated boilers and stoves, 336; embers from:burning rubbish 177 and spontaneous ignition 145. Remember that every fire, no matter the nature of the premises on which it occurs, helps Hitler I
Thousands of Preventable Fires in London Alone