List of Scottish Patents. 181 



m 



The corresponding formula is M Aq 4 + 4 -J / >S 2 



(c) 



Before the blowpipe it becomes pinchbeck-brown, and the glance metal- 

 lic. The thin laminae are attracted by the magnet. 



Commonly the schiller spar is found alone, more rarely in regular compo- 

 sition with paratomous augite spar, like this mineral and the hemiprisma- 

 tic augite spar in the smaragdite. It is imbedded in foliated masses in a 

 serpentine like mineral, which contains, according to an analysis of Dr 

 Kohler, 



Silica, 42.364 Alumina, 2.176 



Magnesia, 28.903 Protoxide of manganese, 0.853 



Protoxide of iron, 13.268 Water, 12.071 



(with a little chrome) 



Lime, 0.627 



These constituent parts correspond very well with that of the schiller 

 spar ; and therefore the opinion of Breithaupt, (see Hoffmann's Handbuch 

 der Mineralogie, vol. ii. p. 264*,) that the matrix of the mineral is a com- 

 pact variety of schiller spar, or which we may call schiller stone, is correct. 



Art. XXVIIL— LIST OF PATENTS GRANTED IN SCOTLAND 

 SINCE MARCH 10, 1828. 



10. March 10. For certain Improvements in Machinery for Propelling 

 Vessels, which Improvements are applicable to other purposes. To Paul 

 Steenstrup, Esq, city of London. 



11. March 19. For certain Improvements on Power Looms for the 

 weaving of Silk, Cotton, Linen, Wool, Flax, and Hemp, and all Mixtures 

 thereof. To John Harvey Sadler, county of Middlesex. 



12. March 25. For Improvements in making Healds for Weaving pur- 

 poses. To William Pownall, county of Lancaster. 



13. March 25. For Improvement in the Manufacture of Buttons and 

 in the Machinery or Apparatus for manufacturing the same. To Thomas 

 Tyndall, county of Warwick. 



14. March 25. For a New or Improved method or methods of propel- 

 ling Vessels through or on the water by the aid of Steam or other Means 

 or Power, and which may also be applied to other purposes. To John 

 Lee Stevens of Plymouth. 



15. April 3. For certain Improvements in Machinery for the Manu- 

 facture of Bobbin Net Lace. To John Levers of Nottingham. 



16. May 6. For certain Improvements in making Iron or in the me- 

 thod or methods of Smelting and making of Iron. To Thomas Botfield, 

 county of Salop. 



17. May 19. For certain Improved Machinery for Breaking or Prepar- 

 ing Hemp, Flax, and other Fibrous Materials which he denominates " the 

 Rural Mechanical Brake." To Count de la Parde, county of Middlesex. 



18. May 19. For certain Improvements in the Construction and Fas- 

 tening of made Masts. To Thomas Hillman, county of Middlesex. 



19. May 19. For certain Improvements in Cutting Paper. To Ed- 

 ward Cowper, county of Surrey. 



