This article revisits the interplay between enterprise, technology, science, and the state in the latter stages of Prussia's “early industrialization.” Tracing the footsteps of Werner Siemens as he sought to establish a business in Berlin during the 1840s, it highlights the social networks that enabled individuals and ideas to circulate between the military establishment, administrative departments, scientific circles, and entrepreneurial communities. At heart, these abstract entities constituted dense clusters of individuals who shared strong connections to one another, but whose contacts with other groups also enabled them to mobilize resources. During the 1840s, fostered by the dynamism of Berlin's expansion, social networks stepped into the breach caused by the Reform Era's upheaval of traditional employment structures and the emergence of a market economy. They provided a means of negotiating the uncertain socioeconomic circumstances that characterized Vormärz Prussia.