[Construction Bureau.]

[The Bronx Office of the Topographical Bureau.]

[The Bronx Office of the Topographical Bureau.]

[Construction Co.]

[Department of Street Improvements.]

[Louis Risse, Chief Engineer, Topographical Department.]

[Louis Risse, chief engineer of the Bronx Street Improvements Department.]

[Department of Street Improvements, drafting room and map makers.]

[Bronx Department of Street Improvements.]

[Department of Street Improvement, chief engineer's office.]

[Survey of annexed district in the Bronx.]

[Surveying and measuring base lines in the East Bronx.]

[Triangulation of Greater New York.]

[Louis Haffen & staff, northside Board of Trade.]

[Book and door keepers and messengers.]

[Department of Street Improvements.]

[Topographical Bureau.]

[Surveying Tower.]

[Engineers in tunnel during construction of present IRT at City Hall Station.]

[Construction near Grand Central Terminal.]