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The 5th order Franklin which is the same as The 6th will burn 18 hours without variation the wick having trimmed. The 4th order will burn only 14 hours [[strikethrough]] there [[/strikethrough]] this is the extreme of the 4th the 5th may in some cases when not disturbed by drafts and shaking
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[[in pencil]] 25
Mr Frank proposes to make lamps on his plan for the 4th and [[insertion]] all [[/insertion]] orders above. Will give more stability of action. In the higher orders to heat the oil and displace the mechanical lamps.   
Mr Frank thinks the cause of the irregularity after 10 hours is due to the greater length of