The theory and practice of hygiene (Notter and Firth) / by J. Lane Notter ... and W. H. Horrocks.
- James Lane-Notter
- Date:
- 1900
Licence: In copyright
Credit: The theory and practice of hygiene (Notter and Firth) / by J. Lane Notter ... and W. H. Horrocks. Source: Wellcome Collection.
Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.
108/1146 page 86
![A dear or fresh Solution of Starch. Solution Jf Sodium Thiosulphate, containing 7-75 g«f//,^^;^ sulphate of soda, in a litre of distilled water. One c.c. of tins solution '-''^T^I^r^^ of rSnioutlied bottle A (see fig. 4), of m l :'aS closed with a caoutchouc stopper -^P Through one passes the tube B, connected by a rubber tubmg at its^^^^^^ end with the burette C -^^^f^^^^^^^^^^^ Id^cXVough a tW openi! l^asses the tube E which cL, by means of rubber tubing, be attached to the oidinarv-a^ supply. Through the fourth aperture is passed the tube for the S exit and to the end of this is attached sufficient tubmg to aUow the ine gas exit, duu uu ^^^^ ^ .^^ placed m a the neck of the separator D when the stopper is removed. A small piece of glass tube projects through this cork to allow of the escaping gas being ignited. The separator D is filled with the water to be examined, and 1 c.c. of the nitrite iodide and 1 c.c. of the acid solution are added, and the stopper instantly fixed in its place, displacing a little of the water, and including no air. By inverting the separator a few times, a uniform admixture of these re- agents with the water is secured ; then its nozzle is pushed through the bottle cover, and the whole allowed to stand for fifteen minutes to enable the reaction to become com- plete. A rapid current of coal gas is now passed through the bottle A, until all the air is displaced, and the gas burns at G with a bright flame. The flame is now extinguished, the stopper of D STemoved ^^^^^^ at G, Ling so regulated that only a small flame is P^^^^i^ied. .^^ ^ ^^^.^ ^^^^ ^^j^^,, Thiosulphate IS now f J^^^ ^ ^ttlo solution of starch is then colour of the lodiue ^s n^^^^ ^^^^ .^^^ ^ , poured into D, and about i . j j thiosulphate is continued opening the stopcock, titiati^ 1 ^.^^^ ^^^^^^^^^ ^^^^^ ^.til the blue «f «^^;;;Ve ot'en^^ the thiosulphate solution ; if a few seconds, duo to the oxygen m.so howeyev, effects the so, the further a^Jtion of a few ^lo^ ^^^^^^ J^^^.^^; ^^^^^ ,3,^ off final discharge, l^^^'^'^^^ ]^^^^^^^^ a, or the oxygen dissolved and recorded. Oall tms e- ^ ^ • ^^^^ j ^.c. of the nitrite- ;^l\tuo:^;nh1'oC^->e »ci/a.d .... solution added.,,« .](https://iiif.wellcomecollection.org/image/b2135764x_0108.jp2/full/800%2C/0/default.jpg)
