. Scientific American Volume 51 Number 15 (October 1884) . e case in country houses, wherethe roof is a conspicuous object in the architecture of thebuilding, a dark color be indispensable, the use of pureVenetian red darkened with lampblack is recommended asthe most durable and economical. If by some process theoil used in roof painting could be prevented from becominghard and brittle, it would be a great gain. The poorest oilpaint, however, is better than neglect; and the best econo-my consists in keeping tin entirely and thoroughly protect-ed from the corroding influence of dampness. Old pa
. Scientific American Volume 51 Number 15 (October 1884) . e case in country houses, wherethe roof is a conspicuous object in the architecture of thebuilding, a dark color be indispensable, the use of pureVenetian red darkened with lampblack is recommended asthe most durable and economical. If by some process theoil used in roof painting could be prevented from becominghard and brittle, it would be a great gain. The poorest oilpaint, however, is better than neglect; and the best econo-my consists in keeping tin entirely and thoroughly protect-ed from the corroding influence of dampness. Old paint,which has become fatty from exposure to the atmosphere,is better than new for roof painting. Not a drop of turpen-tine should be used for such work.—The Metal Worker. SiB FREDERICK Pelgkavb Barlee, Govcmor of theBritish island of Trinidad, and a distinguished man of sci-ence, died recently. His valuable services in promoting theprosperity •f Belize, Honduras, are well known. © 1884 SCIENTIFIC AMERICAN, INC. 230 ^dtntiiU %mm(M. [October ii, THE E££LY UOIOB DECEPTION. Another chapter in the history of this time-worn, stock-jobbing deception was lately completed by a public exliibi-tion at Sandy Hook, N. Y., on Sept. 20, of a pretended etheric force gun; but which m reality, to our eye, was no-thing more than a clumsy air gun, from which a few bulletswere discharged. Keely was present and performed as ajuggler, much to the satisfaction of the assem-bled crowd of New York stock brokers, whoseemed to relish the Keely jargon and the muddyclarity of his absurd explanations. In brief, Keely and his assistants brought tothe ground a small air gun, shown in our engrav-ings, with a cylinder charged with compressedair. The cylinder was connected by a smallpipe with the breech of the gun; thin disks ofhard and soft rubber formed a partition betweenthe breech air chamber and the bullet. Theperformance consisted first in the turning of theair faucet by Keely, then while the
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