Smithsonian Report. 1951. — Watkins 



Plate 8 



Patent models illustrating inventive ingenuity: Left, Rosin lamp, with heater underneath 

 to keep the rosin fluid, patented by Prentice Sargent, Newburyport, Mass., March 4, 1856. 

 Middle, Lard lamp patented by Silas B. Terry, Plymouth, Conn., February 24, 1843. 

 Right, Fluid vapor lamp patented by C. A. Green, Philadelphia, April 21, 1857. The 

 small burner seen at right superheated the volatile fuel in the large burner, causing it 

 to vaporize and burn as a gas. 



Patent models of lard lamps using pressure to feed fuel to wicks: Left, Tin lard lamp pat- 

 ented by John Grannis, Oberlin, Ohio, August 25, 1842. A plunger drives lard from 

 secondary reservoir to primary reservoir and wick. Middle, Maltby and Neal's lard lamp 

 patented by Benjamin K. Maltby, Rootstown, Ohio, May 4, 1842. The patented feature 

 is a pair of perforated copper wick tubes to assure equal distribution of lard into wicks 

 when pressure is applied, preventing wicks from being displaced. Right, Lard lamp 

 patented by Thomas Sewell, New York, October 2, 1847. Turning the inner portion of 

 the base forces the lard upward. 



