skylights. Buildings as high as six stories have been successfully constructed and a complete demonstration made of the practicability of the system to high, as well as low, structures except, perhaps, for a slight difference in cost of equipment for erection. Fig. 8, being a view of the office, oil house and stable of the National Lead Co. at St. Louis, Mo., illustrates the general application and appearance of their typical Unit structures. Fig. 9. The Ohio Cultivator Works, Bellevue, Ohio, under construction, illustrates the typical details of the interior members. and general method of erection. Fig. 10. The National Enameling and Stamping Co. at Granite City, Ill., illustrates the general interior appearance of a completed unit constructed factory. It will be noted that the principle of design in these connections is quite identical, that is sufficient steel is exposed at the joints so that when the field concrete or grout is poured in there is sufficient bond between the field concrete and the steel to take care of all necessary stresses. Where concrete wall slabs are used these are made to span from column to column and held in position by slots cast in the column. Fig. 12 shows the method of splicing the column. It will be noted that the column is held in position by means of the clamp, permitting the proper overlapping and exposure of the steel to be grouted in at the joint, the clamp being removed when the field concrete has properly set. The field equipment for manufacture, handling and erection of these members is a very important factor. |