404 Mr. C. Barus's Comparison of the Bourdon, 



6. The Tait Gauge. — In Table III. I give two series of 

 cyclic comparisons of the Tait gauge with the Amagat mano- 

 metre. The plan of work is similar to that described in § 3. 

 Readings were made in triplets. An interval of two minutes 

 was allowed for cooling after each step of compression. The 

 Tait gauge used is the same to which inv earlier observations 

 apply*. The interval of comparison is 1500 atmospheres. 

 At the end of Table III. a short resume of the factors (cm./atm.), 

 corresponding to consecutive pressure-intervals, is given. 



Table III. — C} r clic Comparison of the Tait Gauge (steel 

 tube) with the Amagat Manometre. 



Tait. 

 cm. 



Amagat. 



i Tait. 



Amagat. 



Tait. 



Amagat. 

 atm. 



atm. 



cm. 



atm. 



cm. 



1265 



1 



40-72 



786 



58-58 



1294 



1>1 -05 



248 



3192 



539 



C»5 42 



1481 



20-73 



239 



31-57 



530 



6405 



1437 



29-35 



4S7 



22-44 



271 



6250 



1398 



28-75 



468 



22-49 



272 



62-00 



1384 



40-80 



804 



1305 



1 



58-50 



1289 



39-72 



768 



1285 



1 



58-15 



1277 



51-05 

 5016 



1087 







4949 



1038 

 1022 



1059 







49-28 



5920 



1305 



1290 







40-45 



785 



57-80 



1266 



21-30 



246 



40-23 



780 



64-90 



1460 



2095 



236 



29-86 



489 



6398 



1432 



3017 



498 



29-50 



480 



63-30 



1414 



29-25 



484 



2001 



210 



62-50 



1394 



38-82 



743 



20 06 



209 



5720 



1247 



38-09 



724 



12-85 



-1 



5665 



1230 



50-14 



1057 



12-93 



-1 



4905 



1020 



4910 



1033 







4100 



796 



60-19 



1335 ' 







Factors of th 



e Tait Gauge. Mean Factor '03596 cm 



atm. 



8eries. 



Pressure- i ^ , 



t Factor, 

 interval. 



Means Q . 

 on and off. feeneS - 



1 Pressure- 

 interval. 



r . Means. 

 I actor. -, '„, 

 on and off 



atm. 

 I., on ... 



cm. atm. cm. atm. 

 200 to 1100 03580 



IL. on... 



atm. 

 200 to 1000 



cm . -at m . cm. 'atui . 

 •03544 1 



L, on ... 



500 to 1300 



3640 



[-03628 II., on... 



500 to 1300 



3602 [ -03590 



I., on ... 



800 to 1500 3664 



J II, on... 



700 to 1500 



3625 





I., off... 



800 to 1400 -03595 



| n.,off...j 



800 to 1400 



•03604 



1 



I., off.. 



500 to 1200 



3577 



1-03576 II., off... | 



500 to 1300 3591 



•03591 



I., off... 



300 to 1000 3555 



) IL.offJ 



200 to 1000 1 3579 



1 



* This Magazine, [5] xxx. p. 344, § 18 (1890). Gauge No. 1. 



