﻿424 Mr. A. Ferguson on Photographic 



same plate showing a pendent drop formed under greater 

 pressure. 



Photograph A. 



Fluid, distilled water. Temp. 11° C. Difference of level 

 between horizontal surface of water in beaker and vertex of 

 drop =1*222 cm. 

 = /i, say. 



Diameter^ of tube on photo = 1*051 cm. True diameter, 

 measured directly = "4459 cm. 



, ,, 1-222 x -4459 



Irue value or n = ^ Ag1 



1-051 



= '5186 cm. 



Asa check on the value obtained from the photograph, a 

 direct measurement of h was made by a travelling microscope, 

 giving as a result 



7i=3-41j3-2-902 = -516cm. 



Photograph B. High magnification, showing drop alone- 



(Length-measurements in all cases given in centimetres. 

 X and Y are actual readings of microscope, x and y the co- 

 ordinates of points on the meridional surface referred to the 

 vertex as origin.) 



Extreme coordinates of drop 

 #=—3*606, ?/=l*7155; and #=3*485, y=l*6435. 



Diameter of tube on photograph B = 7*166. 



True diameter, measured directly ="4459. 



Tv/r •/• • 7*166 



Magnification = -7-7^ = 10-0/ . 



4459 



Table T. 



Y. 



X. 



y- 



X. 



«•. 



x\ 



x~y. 



If- 



y'-y- 



7 054 



7 500 



•2705 



1515 



2-2950 



5-2660 



•6209 



•2701 



-•0004 



G-985 



7-700 



•2015 



1-315 



1-7290 



2-9890 



•3483 



•2029 



+ •0014 



6927 



7-900 



•1435 



1-115 



1-2430 



1-5450 



•1783 



•1459 



+ •0024 



6-882 



8-100 



•01)85 



•915 



•8372 



•7009 



•0625 



•0983 



- -0002 



6-844 



8-300 



•0605 



•715 



•5112 



•2613 



•0309 



•0600 



- -0005 



6-814 



8-500 



•0305 



•515 



•2052 



•0703 



•0081 



•0311 



+ -0006 



6-797 



8-700 



•01 85 



•315 



•0992 



•0098 



•0013 



•0117 



-•0018 



6-787 



8-900 



•0035 



•115 



•0132 



•0002 



•oooo 



•0015 



-■0020 



6-786 



9100 



•0025 



4--085 



•0072 



•0001 



•oooo 



•0008 



-•0017 



6-795 



9-300 



•0115 



•285 



•08 I 2 



•0066 



•0009 



•0095 



-•0020 



6-812 



9-500 



•0285 



•485 



•2352 



•0552 



•0067 



•0276 



-•0009 



6-840 



9-700 



•0565 



•685 



•4692 



•2202 



•0265 



•0551 



- -0014 



6-876 



9 900 



•0925 



•885 



•7882 



•6134 



•0724 



•0919 



-•0006 



6-925 



10-100 



1415 



1-085 



14760 



13330 



•1664 



•1384 



-•0031 



6-977 



10-300 



•1935 



1-285 



1-6500 



2-7230 



•3198 



•1986 



+ •0001 



7041 



- 



10500 



•2575 



1-485 



2-2040 



4-8580 



•5675 



•2587 



+ •0012 



X,r 4 = 20-702. 



2a*t' = 2-4302 



