Current Literature 723 



number of pounds per board foot of lumber, supported by beams, is 

 also shown, which will assist in effecting economical designs. 

 Tables have been computed which show the safe loads on beams 

 limited by the horizontal shearing stress. Other tables show 

 safe total loads on columns of various sizes and still other tables 

 give the maximum spans for mill and laminated floors, board 

 measure for various dimensions and lengths, and board measure 

 and weight for unit lengths of Douglas fir dimension timber. 



"Data and figures are given on timber frame-brick mill build- 

 ings, showing costs, insurance rates, and details of construction. 

 Standard formulas for computing stresses covering the usual prac- 

 tical conditions are given. A grading rule for securing structural 

 timbers of high strength is also included. 



"A considerable amount of data is presented on the creosoting 

 of Douglas fir lumber in various forms, such as bridge stringers, 

 mine timbers, piling, ties, bridge caps, paving blocks, silo staves, 

 and other forms. Space is devoted to wooden silos and Red cedar 

 shingles. Kiln drying lumber is briefly discussed as well as other 

 subjects of interest to the consumer of wood." 



Instructions for the Scaling and Measurement of National Forest 

 Timber. U. S. Dept. of Agriculture. Contribution from the 

 Forest Service. Washington, D. C. Revised July, 1916. Pp.94. 



The revised scaling instructions are of wide interest because they 

 set a standard of excellence towards which all scalers should 

 work, whether in public or private employ. The exact scaling 

 enforced by the Forest Service under the Scribner Decimal C 

 rule is a step towards decreasing inaccuracy in local scaling methods 

 and towards narrowing the number of log rules in current use. 

 The revised edition has been rearranged and is more logically 

 classified. For example on pages 9-10 under "Defects in the log 

 which reduce the scale" the duplication found in the first edition 

 has been corrected. 



Due emphasis is made that scaling is for quantity rather than 

 quality of material and "not in relation to any particular grades 

 of lumber it will produce" because the unit wUl be more stable, 

 and the basis less subject to individual judgment. The definition 

 of merchantable logs (p. 11-12) will be of value in standardizing 

 the use of volume tables in government estimating. Under "The 

 Log Rule" (p. 13) it would be interesting if the manual had ex- 



