R.R.S. 'DISCOVERY': SCIENTIFIC EQUIPMENT 



173 



drawers, bins and cupboards for the storage of glassware and other gear. A small 

 portion is shut off to form a darkroom, and both darkroom and laboratory are pro- 

 vided with sinks and supplies of fresh and salt water. 



The chemical work was done in a very confined space, with stands for burettes and 

 other apparatus screwed to the bench. Here the hydrogen-ion concentration of sea 

 water was determined throughout the voyage, and, during the last year, all titrations 



I 



Fig. 5. Plan of the Chemical Laboratory in the R.R.S. 'Discovery'. 



for salinity were also made on board. On the chart table a chart-tracing table was fitted, 

 constructed to a design kindly given us by Lieut. -Comdr. J. R. Lumby. This apparatus 

 consists of a heavy sheet of plate glass, mounted in a wooden frame and lighted from 

 below by an electric lamp which can be moved anywhere in a horizontal plane. With it 

 tracings can be made on thick paper, clips suitably mounted on the sides of the frame 

 serving to keep the sheets adjusted while the work is in progress. A chemical balance 

 is screwed to the bulkhead, but could, of course, be used only when the ship was in 



