INSTRUMENTS USED IN ENGINEERING LABORATORIES. 
Taste II, 
Comparison of Observer's Greatest and Least Values of Extensions with his 
own Mean Values. 
j 
Mean per 
| for exch bar 
\cent.deviation 
| 
— 
Oe Hee Ss 
ce. 263, 8) 
a4 2°95 
2 
o> 
to 
. Rar | Greatest | Least | strineer | from mean 
Beer No. Sh interval of 2h or | TEST | «ofeach, ieviatton 
1; ton observer Tesults 
2m 
ABW.E .|A | 00200-00140 j-oo1775 | *"Hnnees a3 | 
ZL | -00225 00205 |-ooa1g | * 00110 ial 
| (700160, 00140 | 00160 rahe eer f 
| |-oo160» j00140 |-oo1s1 | + "00080 738 f 
J. A.E. (| -oos2 |oous |-oo19 Somme. | ier | 
(EK | 00172 foo1ss |-oo170 | *ooo10 | tae} 
H} oie 00122 |-oo128 | *‘ooo10 | oar} 
T.H.B.. . A} -o190 joo17o |-oo1ss + +059 | tio} 
{00220 }00190 00208 = ooteo. | eee | 
| |-00220. |-00190 |-oo210 | + 7000100 one 
yp | [00185 j00140 | oo15s ni er weds 
| | | {-oo16s foo1so |-oo1ss | + 000120 | 7:84 } 
ae Sar ae ores Wael: 
K | -oo17s16|oo1672 |-oo1716 | *Spoo4s | ase | 
| E | 001277 /oo12102/-o01242 | *Sooosis | ae6 | 
iG. «| A] -o0190 |oo1s0 |-oo1ss | +:000020 re 
! | L | -00220 00210 |-o0216 | *Doo60 | a78} 
| F | -00170 | 00150 |-00156 * 0080 35) 
[IG «+ A | 00200 00170 | oo1ss | * Noor40 Tat 
(Students). | L./ -00210 00200 | 00207 ea war: 
_F | 00170 jo0150 |-oo15e | *pooe0 | *2e0f 
| W.c.U. . B | -o18o1 }oo17ss |-oo1sss | *Sooss | 598} 
(Mirror exten- 
someter) K | -ov21s2 }oozoss |-oo2105 | *"Soooey | sis} 
