[PlATKS I. AND II. 



'l)?wai' flasks sur- 

 jOirmliiiK baro- 

 meter cistorns 



Dash pots 



liarometers witli 

 niioroscopes for 

 rpadiuff t-istorn 

 and stf'in thcr- 

 moineters 



Telescope for 

 nliserving: position 

 of images on films. 

 In froiit and be- 

 lilnd are electric 

 lamps for illumin- 

 alint^ the mi-rcury 

 surfaces 



Rack and pinion 



for adjusting 



lieighi of liaro- 



meter 



Vui. 2. 

 Sliowing- the Pliotographic Appaiatus. 



minafioit of Gravity at Sea. 



[Between pages 82 and 83 



