Station Park | 18, 28, 36, 40, 50 fl | U/C

[taylortbb]

Those small cranes that have been mentioned are derrek cranes, which while they do take down the main tower cranes often also help carry out other finishing touches that are unnecessary for a tower crane.

Searching for info about this led me to https://www1.nyc.gov/assets/buildings/pd...cranes.pdf , which I thought I'd post here. Nominally it's about powering electrical tower cranes, but it goes over the different types of cranes/derricks, and how they're installed, in the first half. Including details relevant to the earlier posts about external vs internal tower cranes.