Mounting Heater Wires on Glass Capillary-Heat-Transfer Tubes

Two mounting schemes were devised for attaching heater wires to special-purpose glass tubing used in a capillary-heat-transfer experiment. Not only were the wires required to supply heat needed for the experiment; in addition, it was required that the liquid and vapor enclosed by the tubing be visible between the wires. It was a challenge to satisfy these requirements while preventing (1) delamination of wires from the tubing and (2) short-circuiting that can occur as a consequence of delamination. Finally, neither the attachment nor the operation of the heaters could be allowed to impose stresses that could break the tubing.