3 l6 WINDOWS AND SKYLIGHTS 



10. We recommend that a zinc expansion bar be used with brass 

 bolts in preference to wooden bars. We are led to this conclusion from 

 the condition of the zinc cap on the skylights on the Jersey City train 

 shed, which show no deterioration from effect of gas. 



11. We recommend that the sizes of glass used in skylights should 

 not exceed 24 X 36 inches. 



12. We recommend for future construction and, present train 

 sheds, where same can be adopted, a monitor form of skylight, prefer- 

 ably placed parallel with the tracks, of large dimensions; set far 

 enough apart so that one monitor will not obstruct the light of an- 

 other; small sizes of glass, set in wooden or approved metal frames, 

 frames set loose enough to overcome the contraction and expansion of 

 the metal work of the shed. 



13. We recommend ventilating the monitors at the top, the open- 

 ing being covered with an umbrella shelter, also by putting on each 

 side of the monitor an opening under the eaves above the glass the 

 entire length. 



