Nov., 1916
T H E JOC'R.V.IL OF I.VDC'SI'RI.1L . I S D E S G I . V E E R I N G C H E M I S T R Y
sorption of all cnrbon dioxide i n t h e CO? filter. This possibility of easy checking is of t h e utmost importancc because should this filter not absorb all CO? originally contained in t h e gas, t h e subsequent oxidation a n d measuring would be of no valuc as t h e result would not truly indicate t h c amount of CO therein. When t h e cock t o t h e right is in this position t h e gas is first allowed t o pass through t h e filter where i t is freed from all CO,. From there i t passes directly into t h e moisture regulator wherc i t is hrought t o t h e proper temperature a n d t h e n it passes into t h e CO? recorder t o be measured for CO?. If t h e filter has performed its
1037
plate so t h a t the saturation of the absorbent may he observed without disturbing t h e apparatus. T h e absorbent is originally colorless b u t bccomcs rcd as it absorbs Con,which color gradually spreads over the whole filter a n d remains as long as the absorbent retains its absorbing quality. .4s this latter diminishes, t h e original appearance of t h e absorbent is resumed. T h u s t h e filter shows when it needs replenishing. The absorbent will last from one t o two weeks according t o t h e numbcr of analyses desired a n d is re-charged with no more labor t h a n is involreil in t h e winding of a clock. Position 4 is used for the checking of the pipc-lines for leaks. With this apparatus t h e analysis is made entirely automatically a n d at a rntc of u p t o j o per hr. T h e correctness of t h e analyses is readily checked by t h e simple turning of a cock :is above described. Besides, t h e same instrument can he used for carbon dioridc as carbon monoside and if provided with a second auxiliary also for oxygen a n d should, therefore, find a great field in t h e various industries a n d power plants. The instrument as shown in Fig. 111 is adaptable f o r recording sulfur dioxide gas, only in this case t h e parts of t h e machine t h a t are coming in contact with the Rases within the machine. are made of special metal which will withstand their corrosive action. Either KOH or a n iodine solution is used as absorbent. 21
PARK
now. NBW
YORK
CITY
A NEW APPLICATION OF THE BUNSEN VALVE Ry ALAN I,EICIITON Heceived S e p t ~ m h c rIS. 1916
function properly, there should tic no COXleft a n d t h e recorder should score zero, which will be found t o be t h e case when t h e apparatus is in proper adjustment. By means of this operation one can satisfy oneself t h a t t h e gas, which passes t o t h e electric oven when t h e cock at t h e right is in Position I , is free f r o m CO, a n d when after passing i t through t h e oven i t shows a certain amount of COI, this must have been caused b y t h e burning of t h e CO and CH, t o COI a n d can be relied upon as correct. The absorbent in t h e oven will l a s t indefinitelv. T h e carbon dioxide filter is provided with a glass ~~
Everyone who has worked with suction pumps in t h e laboratory knows t h a t occasionally t h e water pressure goes off, t h e p u m p backs up, a n d t h e filtrate in t h e filter flask becomes contaminated. This can be prevented of course b y t h e use of a Woulfe bottle between t h e pump a n d t h e suction flask, b u t even this safety flask is not always :i safeguard, f o r it may become filled a n d overflow. This is particularly t r u e if one is trying t o distill under a vacuum. I t would seem t h a t some simple valve could be constructed t h a t would prevent this danger. There are several such valves mentioned in t h e literature b u t t h e y all have their limitations.' Since I A. Kunn. C h m . Zm.. ~. S I . 1136: Clwm. :lbs.. 1. No. 5 . S97; .&no".. Chrm. ZII., S4, 5 0 ; C h c n . Abr.. 8 , 2363: A. Berz, Bull. so
