Self-acting Safety Regulator and Coal Economiser. 125 



In preparing the necessary drawings for these abstracts the 

 photo-lithographic process has been resorted to, by which a 

 great saving of expense is effected. Since the use of photo- 

 lithogi'aphy by the Victorian Government to illustrate 

 patent publications, the same method has been similarly 

 adopted by the Washington office, and, it is said, with 

 the most satisfactory results. 



Art. XXXVII. — On Meat Preserving. 

 Contributed by Robert Caldwell, Esq. 



[Read 8th April, 1872.] 



In this paper was described the process of Meat Preserv- 

 ing adopted by the Melbourne Meat Preserving Company, 

 and some improvements recommended by Mr. Caldwell. 



Art. XXXVIII. — On Biangular Co-ordinates. 

 Contributed by Patrick Ford, Esq., M.A. 



[Presented Sth April, 1873.] 



Art. XXXIX. — Self-acting Safety Regulator and Coal 

 Economiser for Steam Engines. By F. Poolman, 

 Esq. 



[Read ISth May, 1872.] 



The frequency of steam boiler explosions in Melbourne 

 and on the gold-fields, induces me to lay before you the 

 following paper, descriptive of an apparatus invented and 

 patented by me in April 1863, for the prevention of explo- 

 sions from careless firing, and for the saving of fuel ; 

 requiring less skill and labour from the fireman. 



It is called a Self-acting Safety Regulator 'and Coal 

 Economiser. 



The apparatus has the extreme of simplicity to recommend 

 itself, is very inexpensive, costing only a few shillings per 

 horse-power of steam boiler ; can be manufactured by any 

 ordinary blacksmith ; and in practice, is found to cost 



