Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 198
soaked inmelted solid paraffin. A good paraffined cork was tightly fitted withinthe boxwood ring, and hollowed at one end to receive the Swan lamp.The insulated wires were scraped, and passed through the cork, theends being left projecting a few inches whilst being soldered to theplatinum loops; on… … connection. [The weak point of the ordinary Swan lamp holder is thebrass spiral spring; this will not stJind the damp of the observatory, asI have noticed the brass become so excessively brittle that it falls topieces on being touched. The last time this occurred I substituted aspring of copper…
Science · Technology · Meteorology · Patents
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
