GREENHOUSES 



39 



to resist either tensile or compression strain which may be 

 applied according to the direction and pressure of the 

 wind. So independent does the roof thus become of 

 column supports that it is now compatible with the best 



Sweet Pea House at Harold Morgan's, Auburn, N. Y. 



of practice to construct houses 40 ft. wide without columns, 

 those up /to 65 ft., inclusive, requiring but one on each side 

 of the roof and two for the 75 ft. width. 



" A factor greatly increasing the facility and economy 

 of erection is the system of wrought iron gusset plates by 



