THE following photographs showing the operation of waterproofing the walls and floor of one of the new power houses now in course of construction in New York for the N Y. C. & H. R. R. R. are given to illustrate the proper application of Tarred Felt and Coal Tar Pitch for that purpose.

   In Nos. I and 2 are shown how the alternating layers of Tarred Felt and Pitch are applied,

while in No. 3 a view of the floor surface shows the six plies or layers of Tarred Felt cemented together with Pitch, over which a final coat of Pitch is to be applied. The Concrete walls shown in all the photographs were built to receive the Waterproofing.

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