CONTENTS. xiii 



4. Mechanical Refrigeration 323 



A. Application of, in Creameries 323 



B. Chemicals Used for Mechanical Refrigeration 324 



C. Principles of Producing Cold Artificially 324 



a. Compression. 



b. Condensation. 

 C. Expansion. 



D. Transferring the Cold 326 



CHAPTER XXII. 



Economic Operation of Creamery 329 



1. Firing the Boiler 329 



2. Burning Wood or Coal 330 



3. Daily Weighing of Coal Used 331 



4. Cleaning the Boiler 332 



5. Priming of Boilers 332 



6. The Injector 333 



7. Oil-separators 333 



8. Belts, Pulley, and Speed Calculation 334 



APPENDIX. 



I. Legal Standards for Milk — Dairy Laws 335 



II. Metric System of Weights and Measures with Tables for 

 Converting them into Customary United States Equiv- 

 alents AND the Reverse 336 



