244 



REPORT OF CHEMICAL LABORATORY 



lk*nzinc 

 Itl.l^l I Jimp 



lioiling takes place in a beaker on wliidi rests a semi-spherical glass evaporating dish nearly 

 tilled with cold water. Very little steam escapes uneomlc used. If the material to he 

 analysed is carried up the side of the beaker it is readily dislodged and brought back into 

 the liijuid by means of the rubber-tipped rod. 



A SlMl-LK FoHM OK Bl.ART I, AMI' KOU FfiK WITH HkNZINE 



As already noted, the acetylene gas employed in these laboratories has been found very 

 destructive of |>latinum ware. After .several unsuccessful attempts to etlect fusions of 

 silicates, etc., by Micaus of spirit bunseiis and aicoiiol blast lamps, the arrangement shown in 

 Fig. 106 was finally adopttd. Tlic blast from a Fletcher blower is divided into two by means 

 of a Y tube. One of these is connected directly with the air inlet of an ordinary blast lam|i. 



I'iG. 106. — .\ SIMI-LI-: lOKM OF RlAST I.AMI' FOR I'SK WITH BrNZIN 



ami the other maile first to pass through one or two bottles containing benzine. Each of 

 these blasts is controlled by means of a stopcock. The air jet of the lamp should be the 

 largest of the three nsuallv sui)i)lied. 



\Yith a little practice in adjusting tin' air su|)plv, fusions mav ]«■ made without difficulty. 

 The Hanii' i-; found to have no lianiiful liVnt on iilMtinniii. 



Conclusion 



In conclusion I wish to acknowledge the very great part whi(di Mr. (roodson has taken 

 in the work which has been done since the beginning of the year. T)i addition to the Nile 

 water examinations, wliirli will be ]inblisheil in the next nport. lie has lent a very hel))ing 

 hand ill practically all the analyses and investigations which have been made since his arrival. 



