Show the use of standard mine mme timbers Is urged promotion of efficiency and econ omy in mining industry by standard leation of mining timbers and by an intensive study of 0 the subject ot of timber preservative treatment is be ing urged by the standardization i division of 0 the american mining congress A special I committee ot of the organization with gerald sher man of the phelps dodge corpora tion as chairman has been applying itself closely to the subject tor for several months and data already obtained indicates the value of the work among the most important sub sul gest lons ions advanced by the committee upon the basis of its completed studies is that which stresses the n necessity tor for encouraging use ot of rational designs in mine timber framing of all kinds although they need not be precisely the same tor for all districts A more general use of framing plants at the source tor for the benefit ot of small mines also is advocated by the committee although the benefits arising from timber preservation are ed in principle the committee has found very little information avail able concerning the value of this practice for application to any par nicular district the recommend a tion accordingly has been made that observations tests and records should be made in all districts so that it can be known as soon as pos sible sidle where the advantage of treat ment lies there is every reason to stan dardine timber framing tor an andl vidual mine or group of mines sass a mr sherman in advocating a plan under which a joint framing plant could be erected in a mining dis brict in which timber could te be framed and sent to any property in the district even a single prop erty however may properly need a good many sizes he declared and while the principle of framing is the same there may be a difference in proportions due to size this by the way may be largely avoided it desirable in square set framing by using the stepped framing of the butte district the general design of jimb r structures may be standardized says mr sherman with simp simplicity licit of design and ease of operation as the principal objects to be sought this would appear particularly in ore chutes and in man ways the question principally is one of safety while in chutes it Is a matter of durability and ease in loading from them it has developed that the widest divergence in mine timbers is found in the ties tor for tracks very little duill la accurately known ot of the bearing power of the ground to support ties but there should be a relation b tween the spacing of the ties and thel the weight of the load on the rail in thel the opinion of the committee economy in the use of timbers de A very largely in selection of ot mining methods which require the least amount of timbering in th a connection consideration has been given to the use of aa as a sub statute for timbering as its use ha has been found successful in many cases and worthy of close attention |