Show 04 arul 1 NO lu AS S MLIS SUll AS till 41 SL as und Jj fu commercial ili ll vt Im epting iu in tha jihun diamond I 1 I 1 I 1 lindt arst KiK inIng tile unit only a few years ago age a coal analysis waa was a complicated puzzle to moat most people hut recently it baa bast become an economic nece salty to scrutinize tho the coal bill oa as care carefully tully as the food bill and ci havu have learn ed that a chemical aniU vla when properly made mado from a sample properly taken la is the eurest teat toot ot of a coal a fuel vain tl TI la Is value la in generally stated in of tho the dri bri tieh tish the thermal rinal unit sometimes abbreviated to D 13 t u the quantity qu antty ot of boat teat nece a aary to raise tho the temperature temper per pera aturo ture of la pound of water onto on degree fahrenheit manufacturers dmd d larg largo f commer caal homes houses havo now found it 16 a matter of economy to determine tho the heating value of fuel purchased for power or healing ani the coal testing laboratory t to considered aa an important ae as the accounting room tile a united states government in making its contracts acta tor for coal requires a guaranty not only as tu ash content it goes go even evert much farther than this and makes an alches au 0 samples plea taken from each shipment to ie whether the standard not by the contract Is ik ing maintained from time to time du 41 g the last six alx lx years the united S 8 tee tea haa has made analyses ol 01 P a largo large number b ot of earo plea of coal collected collect eil by geologists from various and 14 attoa fields most of tho the wore were taken in anticipation of the publication of a goo ogle report on the field from front which they were obtained but for or various the preparation of the several reports haa has been greatly del delved ived and some of them have been postponed for with reports on other areas in la view of the fact that tho the analyses unal are valuable to persons interested te in ill the fields from fro which the a implom were taken the geological survey haa has published tho the data for more than a hundred and sixty lity of the theeo sample samples in lit alulu tin J during the early stages of land nil all analytical work was done by the geological survey but with the establishment of the bureau of mines the analyzing and testing of coals and othor other mineral fuels of the untied states under the law passed to that bureau A number of the coal analyses published la in the bulletin were made under th direction of tho the bureau of mines ml in the tables the analyses alysee an are given in four form forms the first depre berting the sample as it comes from the mine the second the coal after it has been dried at a temperature tempera pera ture a little above normal t tha third the theoretical condition of the coal after all the moisture has been eliminated and the fourth the coal after all the moisture and ash have been removed the last Is in supposed to represent the true coal substance free from the moat most significant impurities copies coples of the report may inay be obtained free on application to the dl bretor of the united states geological r irvey at washington D C |