070 



DR HUGH ROBERT MILL ON THE 



No. of Sample, 



491 



Date, 



22.5.85. 



Hour of Collection, 



13 h -5. 



Position, 



| May Light, N.E. by E. 



{ North Berwick Law, S. \ E 



Depth of Sea, 



29 fm. 



Depth of Sample (d), 



Bot. 



Temperature (t) of Sea at d, 



' . 83°-8(x). 



State of Tide, 



£ebb. 



Weather, 



Bright, swell. 



Colour and Transparency of Water, . . . Deep green. 



Collected by, . 



H.R.M. 



Date and Hour of Determination, .... 23.5.85 — 16 h, 6. 



Temperature of Water (?), 



i. II. 

 13-7(' 4 > 13-8<' B >. 



Hydrometer Load, 



1 1 + 6. 



Hydrometer Reading, . 



900 32-0. 



Density at t'°, -J -^ 



T02548. 



555. 



Mean Density at t'°, . 



102551. 



Density at 15 0, 56, 



1-02506. 



The working out of the results is preserved in the " Calculation Book," and in the 

 instance in question was as follows : — 



491 (1) 



491 (2) 



Calculation of Density. 



2608 

 085 



150-3458)154-1763(1-02548 " 



3-8305 



8236 

 719 

 118 



2626 



578 



1-02551 



150-8406)154-6950(1-02555 j 



3-8544 



8376 



834 



80 



Correction to Standard Temperature. 



491 



646 

 551 



95 



99782 

 97772 



1-02600 



94 (-5) 



97554 



1-02506 



The above statement shows that the two values for the density, calculated from the 

 two readings, differ by 7 in the fifth decimal place. This difference is nearly always in 



