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Image 536 of Annual report. 1915

Part of Kentucky Agricultural Experiment Station

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. I · I · — V " County Agents’ Calcvjmeter. 67 V A A column and- read to the left on the same horizontal line in E, L ._ the column headed 200 Centigrade, or 680 Fahrenheit, where · the figure 97.6 will be found. This is the correct per cent. l , Precautions. — _L All stoppers and rubber tube connections are to be made _i_ei,. fi 2- air—tight before starting the evolution of gas in bottle "D." Q3, `.A·;‘i QQ} Bottle “D" is to be thoroughly washed after each determi- nation, so as to remove all acid before a.second portion of g. _ limestone is introduced. A It is also advisable to saturate the _ Q water in the large bottle "I" with carbon dioxid the first V, time theapparatus is used. This is accomplished by running ' » ` several determinations on the same sample and pouring the ‘ water displaced each time back into bottle "I."—’ The large tf; ,_·4 bottle "I" is to be filled .up near the stopper after each determination. _ ` In testing the limestone rocks of any particular section of the State the county agent should be able to distinguish A - between a rock that is practically all calcium carbonate and ;'` ` one that contains considerable magnesium carbonate. The following suggestions may be of some service to one not familiar with the characteristic properties of the two differ- ent stones. A large percentage of the limestone rocks of Kentucky suitable for agricultural purposes have a dark or light gray color, a crystalline structure, and may or may not contain fossil remains. . The fine_ powder of such stones when treated with 20% hydrochloric acid in a glass vessel produces . a vigorous reaction in which bubbles of carbon dioxid gas are evolved and a sizzling sound produced. If acid is added ` until no more gas bubbles are given off and the vessel allowed to stand undisturbed for a short time, the amount of insol— uble matter that settles to the bottom will indicate the rela- tive purity of the stone. A pure limestone will all dissolve and leave no residue when thus treated. A 1 From the rapidity with which a definite amount of lime- F stone dissolves in hydrochloric acid, and also by the vigor of A the reaction one can soon learn to judge as to whether or not A » F.

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