44 



THE WORLD'S ADVANCE 



visible and not littered with tools, papers 

 and dirt. 



It will be seen that the rule can be 

 set at an angle and moved up and down 

 parallel to whatever position it was set in 

 originally. The balancing mechanism is 

 concealed and moves noiselessly. The 

 frame is of enameled metal and can be 

 dissembled easily. 



Although a Radical Departure from the Usual 



Practice, the Vertical Drafting Board has Many 



Distinct Advantages. 



A VERTICAL DRAFTING BOARD 



A REVOLVING CRANE MAST 



In an endeavor to employ the most 

 economical method to handle the stone 

 and concrete work as well as the bricks, 

 a middle west contractor designed and 

 used a revolving mast crane with a canti- 

 lever boom in building a school. So suc- 

 cessful has this device been in the con- 

 struction of this building that a patent 

 has been applied for covering the use of 

 this style of crane in constructional work. 



As will be seen in the accompanying il- 

 lustration, the school under construction 

 extended over quite an area. However, 

 by the use of the revolving mast crane 

 with cantilever boom, it was found pos- 

 sible to place cut stone at any desired 

 spot and at about one-third of the esti- 

 mated cost. In placing the cut stone the 

 first operation was to lift it high enough 

 to clear the walls, revolve the crane to 



Vertical drafting boards have several the proper position and then run in the 

 distinct advantages over the horizontal trolley over the spot desired. The mo- 

 type, and they are being adopted to an tive power was supplied by a five horse- 

 increasing extent in the most up-to-date power motor at the base of the mast, 

 drafting rooms. A new vertical 

 board has been devised which 

 permits a draftsman to work 

 either sitting or standing. From 

 any position he can bring any 

 section of the drawing before 

 his eyes. The board is fixed at 

 an angle which has been deter- 

 mined by scientists and engineers 

 who have been using the vertical 

 board for years. The drawing 

 implements are placed on a small 

 shelf which moves with the par- 

 allel rule, many unnecessary 

 movements being thus saved. An 

 advantage of this arrangement 

 is that the tools are not in the 



Way and that, quite Contrary tO A School Building Being Erected with the Aid of a Revolving 

 ,, J , ,, j . J . Crane Mast. Much Time and Labor are Saved by the Use 



the usual custom, the drawing is of this Equipment. 



