January 23, 1903.] 



SCIENCE. 



139 



between Rooms 1 and 2, etc. Room 1 is 

 18 X 28 feet, and Room 2 is 18 X 25 feet. 

 Rooms 1 and 2 will be used as research 

 laboratories for weights and measures, and 

 21, 22 and 23 will be used for testing 

 weights and measures. This includes 

 masses from a milligram to twenty kilo- 

 grams, or from a grain to fifty pounds; 

 standards of length up to a meter or a 



general research laboratories, and Room 34 

 will be used as a laboratory for testing 

 watches, chronometers, clocks, tuning forks 

 and other timepieces. 



Rooms 8 and 9 will be used for research 

 and testing of thermometers and pyrom- 

 eters for measuring temperatures outside 

 the range of mercury thermometei'S. This 

 will include the use of thermo-couples, pla- 



Ith.FI^OOR PLiA-M- 



ATTIC TLOOR. PLAJM. 



yard; and measures of voliune, such as 

 pipettes, burettes, standard flasks, of vari- 

 ous capacities up to cubic-foot bottles. 

 Rooms 11, 12, 13 and 14 will be used for 

 research and testing in connection with 

 various methods of making precise mass, 

 length and capacity measurements, in- 

 cluding optical methods and optical instru- 

 ments. Rooms 31 and 32 will be used as 



tinum thermometers, gas thermometers and 

 commercial pyrometers for high tempera- 

 tures, such as those used in ovens and fur- 

 naces, and of gas, platinum, pentane, to- 

 luene and other thermometers for low 

 temperatures down to that of liquid air. 

 Rooms 16, 17, 18 and 19 will be used 

 for investigation and testing of resistance 

 standards, resistance boxes, and shunts; 



