This essay raises the question of material hermeneutics in Heelan’s philosophy of techno-science. For Heelan, a continental philosophy of technoscience, referring to Husserl and Heidegger and especially to Merleau-Ponty, features hermeneutic contexts of mathematics and measurement as well as laboratory observation, including what the later Heelan spoke of as “portable laboratories,” for the sake of objectivity and “meaning making.” For Paul Feyerabend, this material practice corresponded to the use of both techniques of observation and instrumentation, and not less “propaganda” in (...) the case of Galileo which practice for Heelan included the ontological status of measures and numbers as well as apprenticeship in what Heelan called “contingent local practical cultural milieus.” The essay includes a discussion of Heidegger on mathematics and Bruno Latour on pasteurization. (shrink)