Perhaps the most difficult task in the preparation of this 

 pocketbook was the selection of formulae for the use of the 

 designer. It was our purpose to present not only formulae that 

 all engineers must approve, that is, what may be called the long 

 method, but also shorter formulae of more recent derivation that 

 have been found equally true and accurate. The former we had 

 little trouble in securing. The latter, however, promised to delay 

 the publication of the book further and we decided not to intro- 

 duce it until the second edition is printed. We will have some 

 printed in a form convenient for loose insertion, and any pur- 

 chaser of a copy of the first edition can procure one of these 

 pamphlets without cost on request. 



Extracts, original in subject matter or in form of presentation, 

 have been liberally made, with credit in each instance, from the 

 following standard works: 



Reinforced Concrete, by Charles F. Marsh. D. Van Nostrand 

 Co., 23 Murray and 27 Warren St., New York, publishers. 

 Price $7. 



A Treatise on Concrete, Plain and Reinforced, by F. W. Tay- 

 lor and Sanford E. Thompson. John Wiley & Sons, 43-45 E. 

 19th St., New York, publishers. Price $5. 



Architects' and Builders' Pocketbook, by Frank E. Kidder, 

 published by John Wiley & Sons (see above). Price $5. 



Reinforced Concrete, by Albert W. Buel and Charles S. Hill, 

 published by The Engineering News Pub. Co., New York. 

 Price $5. 



The Handbooks of the Cambria Steel Co. and the Jones & 

 Laughlins Steel Co, were also used. 



The following credits were marked for correction in the 

 plates, but the delays in the publication of this work were so 

 many that we decided not to attempt their rectification until the 

 second edition is published, which will necessarily be soon: 



P>i<ls Received for Steel for Concrete Reinforcement, p. 93 

 Engineering News; Comparative Costs of Concrete, p. 98 Engi- 

 neering News; Concretes, p. 108 Edwin Thacher; Data on 

 Beams by Prof. Talbot, p. 146 Marsh; Two Loads Applied 

 Symmetrically to Beams, p. 151 Marsh; Maximum Permissible 

 Tension, Shear, and Bending Mmm-nts for Bolts in Timber, p. 

 152 Kidder; Tensile Strengths of Cement Mortar with Natural 

 Sand, p. 164 Baker's Masonry Construction; Tests of Slag 

 Cement, p. 165 Marsh; Effect of Fineness of Sand on 1:2 

 Cement Mortar, p. 171 Baker; Comparative Tensile Strengths 

 in Ib. PIT sq. in., p. 173 Marsh; Transmission and Hoisting 

 Ropes with Nineteen Wires to the. Strand, p. 179 Jones & 

 Laughlins. 



