English builders give an average inside lap of fay of aninch on either side. For low-pressure engines, working withfrom 2-| to 3 lbs. over pressure, f of an inch is given, while formarine engines, working with from 4-J to 5 lbs. over-pressure,the lap is from 1 to If inches. The rule given for lead… … 1. Piston, down in full. Valve, -J up. 2. Piston, £ up. Valve, quite up. 3. Piston £ up. Valve, J down. 4. Piston, |-| up. Valve, | down. In order to obtain this motion the eccentric must in thicase have an advance of 30 degrees. As the reader wilnotice, the exhaust steam is cut off at i-jj- of the…
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