12 



THE INDIA RUBBER WORLD 



lOnoBhK 1, 1916. 



liorax solution l-ut would remain with the colophony present. 

 Condensation products, as applied, would be insoluble in 

 alcohol and acetone, in which they only swell. The colo- 

 pliony could he recognized in the alcoholic extract and deter- 

 mined. Before long gum lacs are likely to be adulterated by 

 products similar to "Bakelite" when a method is found to 

 produce an alcohol soluble form to meet the requirements 

 of the consumer. 



CHEMICAL PATENTS. 



THE UNITED STATER. 



SYN'THETIC CAOUTCHOUC. An improvement in the man- 

 ufacture of synthetic caoutchouc from isoprene by polymer- 

 ization, consisting in first polymerizing the isoprene and then 

 adiling to the polymerized product ethyl acetate in sufficient 

 quantity to dissolve the caoutchouc-like substances which are not 

 real caoutchouc and to precipitate the real caoutchouc. [Arthur 

 Heinemami. West Kensington, London. England. United States 

 patent No. 1.194,839.] 



Liquid Coatinc. Compiwition. .\ cnmposition of matter con- 

 sisting of Pontianak gum copal, 90 pounds; shellac, 10 pounds; 

 alcohol, 14 gallon>. and benzol, 6 gallons. [Alfred R. Picker, as- 

 signor to Durlacciue Manufacturing Co.— both of St. Louis, Mis- 

 souri. United States patent No. 1,196,276.] 



Reclaiming Rubber. Waste rubber scrap is treated in a bath 

 made of sulphuric acid and an excess of calcium chloride, at a 

 temperature below that of vulcanization; subsequent treatment 

 with a solution of caustic alkali at a temperature below that of 

 vulcanization: removing the alkali and plasticizing in highly 

 heated water [Harry O. Chute, New York City. United States 

 patent No. 1.196.334.] 



169,371 



OTHER CHEMICAL PATENTS. 



CANADA. 



Solution tor inflatirg tires. Louis I.etard, Rochefort-sur-Mere, 

 Charante Infevieure. France. 



THE FRENCH REPUBLIC. 

 479 960 (October 8. 191.';). Vukan'izaWc composition and method for its 

 preparation. J. S. Campbell. 



A NON-SPATTERING WASH BOTTLE. 



To avoid spattering at the tip of the nozzle of the ordinary 

 wash bottle, F. C. Clapp, of the Minnesota Agricultural Experi- 

 ment Station, St. Paul, Minnesota, has utilized the principle of 

 raising the water table of the wash bot- 

 tle slightly al)ove the level of the tip of 

 the nozzle, thus avoiding "back action" 

 by retaining the nozzle permanently 

 full of water. 



The diagram will make the principle 

 clear. While the bottle is in use the 

 thumb is held over the pressure release 

 D, the water is forced up through the 

 tube C till the water-table indicated has 

 been reached, the water level being 

 maintained by the stopper /•". The 

 nozzle works the same as though the 

 wash bottle were full to the raised 

 water level. Before releasing the pres- 

 sure from the mouth piece the thumb 

 is taken off the tube D so that the 

 lieight of the water-table A maye be insured, and to prevent "back 

 action" through B. 



In construction the following details are important: 



1. Make D 5 millimeters, or as large as possible, to afford a 

 quick release of pressure, having it project onlj' to the bottom of 

 tlie small cork in A. 



2. The size (4 millimeters) and length of B are not important 

 except that tlie bottom projects an inch or so below the water- 

 table. 



3. The stopper F should be near the bottom of A for best 

 results. 



4. Tlie tube A (12 millimeters) projects up through tlie stopper 

 and to the bottom of the bottle. 



5. The intake C should be 4 millimeters, or as small as pos- 

 sible, and still give sufficient flow. Its height determines the 

 height of the water-table. 



All dimensions given are outside measurements. 



LABORATORY APPARATUS. 



CONTINUOUS HOT WATER APPARATUS. 



PROF. J. HOWARD ROOP, of Purdue University, describes 

 in "The Chemist-Analyst" a novel apparatus for a con- 

 tinuous supply of hot distilled water for analytical work. The 

 apparatus shown in the cut may be made 

 " by reversing the use of an ordinary worm 

 condenser. 



Connect the condenser C, and steam 

 pipe by means of a piece of pressure tub- 

 ing wired on at R. The outer jacket of 

 the condenser forms a steam jacket for 

 the worm bearing the distilled water. The 

 top of the condenser is iitted with a three- 

 hole rubljer stopper and has running 

 through it three glass tubes; D for the 

 distilled water supply, A for air and S for 

 a siphon, 

 u c^»»-».<. ic^_i The distilled water enters the worm 



fi Ijw ^f°T^^ tube through D and is drawn off at B by 



II // \V ^ length of rubber tubing; the flow being 



controlled by a pinch cock P. The tube 

 at A allows air to enter and should extend 

 a few inches above the siphon. The 

 siphon carries off any extra water backing 

 up in the worm, which can be caught in a 

 bottle for distilled water. The outlet for 

 the condensed steam escapes by the out- 

 let through a rubber tube to drain. 



EXTENSION WEIGHING SCOOP. 



A recent improvement is an aluminum weigh- 

 ing scoop, attachable by means of a bayonet 

 joint to an extension. Samples can be weighed 

 and introduced into flasks and narrow openings 

 without transferring or getting any of the ma- 

 terial on the sides of the flask or other recep- 

 tacle. There are frequent occasions where the use 

 of this little instrument is very desirable, as it not 



Illy prevents any loss of materials by placing the 

 weighed sample precisely where wanted, but in 

 this way obviates excessive use of reagent to wash 

 adhering substance from the neck of narrow 

 vessels. It is a great convenience in many deter- 

 minations. [Scientific Materials Co., Pittsburgh, 

 Pennsvlvania.l 



HYDROGEN SULPHIDE CONTAINER. 



Kriist Richter has de\ ised a container for hydrogen sul- 

 phide in the absence of a hood It is described in "Chemical Ab- 

 stracts" as follows : It is recotnmended that liydrogen sul- 

 phide water be filled into a small Ijlack-lacquered separatory 

 funnel, the delivery tube (3cm. in length) of which is sup- 

 plied with a perforated cork, so that the apparatus when not 

 in use is closed by fitting a test tube on the cork. When it 

 is desired to apply the reagent, the test tube is replaced by 

 another containing the material to be tested. 



Replete with information for rubber manufacturers — Mr. 

 Pearson's "Crude Rubber and Compounding Ingredients." 



