Building Code whether each item is specifically mentioned and shown or not.

Damages. The contractor shall be responsible for all damages and injuries that may occur to persons, animals, vehicles or adjoining property, from whatever cause, during the progress and in connection with his work.

Personal Attention. The contractor is to give his personal attention to the work and shall have a competent foreman on the job at all times.

Tackle. The contractor shall furnish all planks, ladders, scaffolding materials and appliances necessary to complete his work to the true intent and meaning of the plans and specifications.

Bond. The contractor will be required to furnish a bond through a recognized Surety Co., or two approved bondsmen, for the amount of fifty (50%) per cent. of this contract, to guarantee the faithful performance of this agreement.

Deliveries. Shall be made in the order required for erection, and at the time specified in the contract. If deliveries are not made at the time agreed upon, the architect may purchase materials in the open mraket at such terms and for such deliveries as in his opinion shall meet the requirements of construction. The cost of such material so purchased and of its delivery to the job shall be deducted from the amount due under the contract.

QUALITY OF MATERIAL.

General. All cast iron and structural steel should be the best of its kind, both as regards quality of material and process of manufacture.

Finish. All finished material shall be straight, of correct section, and shall have smooth, clean, surfaces, free from cracks, seems, buckles or other defects.

Weight. A variation of three (3%) per cent. for cast iron and two and one a half (22%) per cent. for steel from the estimated weights will be allowed in the finished material. Additional weight in excess of these allowances will not be paid for. Any single member or piece of material which weighs less than the estimated weight by more than the above. allowance, may be condemned at the discretion of the archi

tect.

MANUFACTURE.

Castings. All castings shall be of good foundry mixture. Only such scrap iron as may be approved by the architect or

his inspector shall be mixed with the metal used for castings. All castings shall be clean, tough gray iron, free from blowholes, honeycombs, cold-shuts, cinders, sand, shrinkingcracks or other defects, correct as to pattern, neat as to finish and not warped. All castings shall be allowed to cool slowly in the sand to avoid shrinkage strains. Castings of incorrect dimensions and warped castings may be rejected at the discretion of the architect.

Steel. All steel shall be manufactured by the Openhearth process, and shall be uniform in quality. Chemical analyses for each furnace heat must be made by the rolling mills and checked by the inspector. No steel shall contain more than .08 per cent. of phosphorus, nor over .06 of sulphur.

Rivet Steel shall be "soft" steel. All other steel shall be of "medium" grade complying with tests below specified.

Tests. Cast Iron. Two specimens, each 1 in. sq. shall be cast in sand molds for each furnace heat. One of these specimens shall be turned to a diameter of 3/4 in. for about five inches. It shall then be broken under tension and it shall develop an ultimate tensile strength of at least 18,000 pounds per square inch. The other specimen shall be supported horizontally on two knife edges 12 inches apart. In this position the specimen shall be capable of sustaining a central concentration of 2,500 pounds, with a deflection of not less than 3/16 of an inch.

Castings shall not break when struck with a sledge hammer. A blow from a hammer upon the edge of any casting shall show an indentation without crushing or chipping off the metal.

Steel. Two specimens cut from finished materials of each furnace heat must be furnished by the rolling mill. Such specimens and all material rolled from the same melt shall be marked for indentification with the number of the original furnace melt. Each specimen shall be I in. wide, 18 in. long and of the same thickness as the rolled material. One specimen shall be broken in tension in a testing machine and shall show an ultimate strength of 54,000 to 64,000 lbs. per sq. in. for "medium" steel and 50,000 to 58,000 lbs. per sq. in. for "soft" steel. Its elastic limit shall not be less than 32,000 pounds per sq. inch and a minimum elongation of not less than 25% in eight inches. If the first specimen fails to develop the required strength and elongation, three other specimens may be tested at the discretion of the inspector, and if two of these specimens do not fulfill the above requirements, all material rolled from the corresponding furnace melt shall be condemned. The second specimen shall have one end heated to a

cherry red, quenched in water and bent; the other end bent cold. Both bends shall be 180° flat and shall not develop any flaws.

SHOPWORK.

General. All workmanship shall be first class in all respects and in accordance with the best shop practice.

Shop Drawings. All working shop drawings shall agree with the plans furnished by the architect and must be signed by the architect before work commences. The shop, however, must make good, without charge, any errors resulting from not following the architect's plans and errors of clearance or connections. The architect shall be furnished with not less than two sets of working plans and two sets of order lists of materials.

Dimensions. All members must be of correct length, in accordance with plans approved by the architect.

Punching. All rivet holes shall be laid out by means of a template, accurately spaced and in a true line. The diameter of the die should not exceed the diameter of the punch by more than 1/16 inch for material 1⁄2 inch thick or less, nor 3/32 inch for thicker material. All rivet holes shall be clean cut and free from cracks and burrs. Burrs shall be removed by reaming. The diameter of the finished hole shall not exceed the diameter of the rivet by more than 1/16 inch.

Straightening. All material must be straightened before and after punching.

Assembling. Before riveting, built members shall be provided with a sufficient number of bolts to prevent bending or warping during riveting.

Drifting. No drifting of holes will be allowed under any conditions. Holes that do not match shall be corrected by reaming or by new material, or by both, at the discretion of the architect.

Reaming. Shall be used to make holes match. Built-up girders shall have rivet holes punched inch smaller, and then the holes shall be reamed to full size with the parts held in position.

Riveting. Rivets shall be of soft steel and driven by machine whenever practicable. Rivets shall be used for all column splices and for all connections within three feet from each column; other work may be bolted or riveted, at the contractor's pleasure. All rivets and bolts must be 34 inch diameter throughout the building, except in special cases

where it is necessary to use other sizes. The pitch of rivets shall never be less than 11⁄2 inches nor more than 6 inches, while the minimum distance from the center of any rivet to the edge of the shape shall be 14 inches. Rivets should not be used in tension. An excess of 25 per cent. in the number of rivets shall be allowed in all connections to be riveted in the field.

The rivets shall completely fill the holes, with full heads concentric with the holes and in full contact with the surfaces of the metal. All rivet heads shall be neat, cup-shaped, free from cracks on edges, and shall not be burned. All burned, loose or otherwise defective rivets will be condemned and will have to be removed at the expense of the contractor. Any injury caused to the material in removing defective rivets may serve to condemn the injured parts.

Painting. Before any painting is done in the shop all scale, dust, dirt and foreign matter of any kind must be removed from the structural steel. Cast iron work shall not be painted until delivered on the job, reinspected, and approved. All covered surfaces, surfaces in contact and surfaces enclosed on all sides by riveted members must receive one good coat of paint after the pieces are punched and before they are assembled. All steel work must receive one complete coat of paint before it can be taken from the shops or exposed to the weather. All faced ends of columns and other planed surfaces must be coated with white lead and tallow before leaving the shop. After erection, all surfaces, including cast iron, shall be painted one thorough field coat. All painting shall be done on dry surfaces, and no painting shall be done in wet or freezing weather. The field coat of paint must be of a different color than the shop coat. The paint used must be one of the following:

Red lead and boiled linseed oil, mixed in proportion of 23 pounds of lead to I gallon of oil.

Graphite paint No. 26, manufactured by Chicago Graphite Co., or any other paint approved by the architect.

Bases. Cast iron bases must be provided for all columns where shown on plans, and must conform with approved detail drawings. All bases must be planed smooth on top and must be of the required height. The ribs must be arranged in each case so that the entire cross-section of the column shall be directly supported from the bottom of the base. The holes for the bolts connecting the columns to the bases must be drilled to a template and in exact position. Other holes. and grouting holes may be cored.

Cast Iron Columns. All cast iron columns shall be of exact height, with bearing surfaces at right angles to the axis of the column. The ends shall be planed accurately and smooth. Connection-holes shall be exactly spaced and drilled to a template. The top and bottom flanges shall be reinforced by ample fillets and shall be not less than one inch in thickness when finished.

Steel columns shall be made in double story lengths except where otherwise indicated on the column schedule. Columns built of several sections shall be riveted together with 34 inch diameter rivets spaced not more than 6 inches on centres nor more than 16 times the thickness of the thinnest plate. At splices and in the vicinity of beams and girder connections the rivets shall be spaced 3 inches for the full depth of connections. In riveting up built columns due care must be taken to keep them straight and free from twists. All columns shall be milled at each end to a smooth bearingsurface at right angles to the length of the column.

Column Splices. Unless otherwise specified by the architect, all column splices shall be made by riveting splice-plates on the sides of each column with not less than twelve rivets in each column. All splice-plates shall be 1⁄2 inch thick, except where the metal of the columns connected is less than 3/4 inch thick, when the splice-plates may be 3% inch thick. Where the outside depth of one column is less than the other by more than 1/16 inch on each side, the clearance must be taken up with fillers of the same width and punched the same as the splice-plates. Rivet holes in columns and corresponding holes in splice-plates must match accurately. All columns will have 34 inch cap plates. The point at which the change in section is made shall generally be two feet above the finished floors.

Beams. Any beam that is longer than required for its special place shall be rejected. Where beams connect to beams a clearance not exceeding % inch at each end will be allowed. Where beams connect to columns the clearance shall not exceed 1/4 inch at each end. All beam connections, whenever possible, shall be made by means of standard connections, as shown in the Carnegie Handbook, and with the same number of rivets. Any other standard approved by the architect may be used. Wherever the details of the columns will permit, beams and girders connecting to columns shall have not less than eight rivets at each end, four in the top flange and four in the bottom flange. Unless otherwise noted, all beams and lintels are indicated to their approximate lengths and positions by single lines on the floor plans.