before and rescence, are accompanied with chemical action on a area of 150 square feet; and each machine, as our pict- after exposure was sufficient to determine whether any very minute scale, and that all luminescence is there- ures indicate, possesses a vertical and horizontal rud- der of… … THE PILCHER FLYING MACHINE. fore exposure, and the manifestation of sucb color continues only until the cessation of the chemical ac- inclination to pitch sideways—a common vice in all to give a distinctly alkaline reaction. Many sub- like inventions. stances, moreover, which manifest no…
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