Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 243
.Vol. 192, No. 1148—17 234 A. F. Zahm. [J.F.I. Description of Bifilar Balance.—A bifilar balance, designedby the writer, is used at the Washington Navy Yard to measurethe resistance of balloon hulls, struts, etc. Figs, i and 2 show theform of swing used for the study of hulls. Tw^o steel wires,… … Airship hull suspended on bifilar windbalance. end a % inch steel pin, gliding freely through an eyelet in a veryfine stay w^ire stretched across the tunnel, steadies themodel laterally. Above the tunnel a pointer fixed to a cross-bar joining the twosuspension wires moves along a steel scale and…
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