New Britain herald., 1914-04-07
7; Best and l1ost Accate Sp0,1ing News of the Day

stall new cylinder. If the water jacket only is cracked this may be welded by the acetyline process and be used
 Most any automobile repair shop done.
 You state that the dog at the end of the crank handle is soft and wears out quickly. Would suggest that the next time you have this repaired you see that this part is hardened. If this is done it will not wear out so quickly It would be advisable also to use better grade of steel in making the new part.
 Motoring Department, The Herald: Kindly answer the following in your paper:
 l. What is the difference between a low tension and high tension magneto?
 ?. The difference between jump spark and make and break?
 3. Does the piston travel the same distance on the first quarter of the stroke of the crank as it does on the second quarter? If not, why?-John T. Dennis.
 The low tension magneto has only primary winding on the armature and generates a low voltage current This current for jump spark ignition, purposes must be led to a transform CT or induction coil and there stepped up to high tension current.
 The high tension magneto has a. primary winding and also a secon- dary winding on the armature. 1t is self contained and the current pro- duced is of high voltage. In this case it is not necessary 10 use a trans former or induction coil.
 In jump spark ignition the current is required to jump a gap and. in or der to overcome the resistance of this air gap must be of high voltage nature. In the make and break ig- milton the high tension current is not necessary. The electrodes are me- chanically operated and when they make contact the electrical circuit is closed and when they separate the circuit is broken. Upon the separat- ing of the electrodes. which is by me-
 
 across the break constituting the spark for ignition purposes
 The piston travels a greater dis tance in the second quarter than it does in the first quarter of the stroke. This is due to the construc- tion of the crank shaft. When the crank pin of the shaft travels from top dead center to point forty-five Y, ,ir%o very little The crank pin in travel ling through thej next forty-five de- grees causes the piston to travel a much greater distance. When the piston is at top center the connecting rod and offset arm of the crank shaft form straight line. .S This straight line is gradually broken as the crank moves off center In trav- elling through the first and second quarter you may easily note from this illustration the difference in pis- ton travel.
 Motoring Department, The Herald: l have 1913 car which has been running badly for six months. Some times it runs fine for miles and then 9-N i 4 l | ft to miss, consequently jerking the car. Runs o. K. when going fast, when I get down to about eight or ten miles, commences to miss. Spark plugs are O. .K.,a have cleaned and adjusted carburetor, and cannot account for the trouble, un- less valves need grinding, but have only run it about 5000 miles. Will you kindly advise me?
 What is considered cost per mile of running the above car, counting wear and tear, gas, oil and everything? This is a touring car.-Subscriber.
 If the valves do not seat properly you cannot hope to have the motor throttle down. It is advisable to re- seat the valves at more frequent in tervals. Especially is this true with the exhaust valves.
 You state that you cleaned and ad- justed spark plugs and carburetor, but you have neglected to clean and adjust the platinum points in the circuit breaker of the n1agneto. When these points wear, you will find 1t difficult to satisfactorily throttle the motor to slow engine speeds unless they are adjusted. The fact that your motor pulls all right when running fast indicates that this is the source of your trouble. Likewise, you should not forget to frequently readjust the spark plug points when you take them out for cleaning
 Regarding the operating cost per mile would say there are so many unknown quantities entering into such a problem it is difficult to estimate same. Chief among these factors is the personal equation. One person may operate the car econom- ically and another very extravagant- ly. Knowing the conditions under which you operate, you may approxi- mately figure the cost for yourself. In your section the roads may be very rough and hi1lv The price of