400 



List of Patents. 



34. To William Longmaid of Plymouth, accountant, " improvements 

 in treating ores and other minerals, and in obtaining various products 

 therefrom, certain parts of which improvements are applicable to the ma- 

 nufacture of alkali." — 13th March 1843. 



35. To William Barker of Manchester, in the county of Lancaster, 

 mill-wright, " certain improvements in the construction of metallic pis- 

 tons."— 16th March 1843. 



36. To Joseph Whitworth of Manchester, in the county of Lancaster, 

 engineer, " certain improvements in machinery, or apparatus for cleaning 



o:ids, and which machinery is also applicable to other similar purposes." 

 — 22d March 1843. 



