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Variation of the magnetic needle, at London, Dec., 1836
Caoutchouc T l o s e . ~ V a r i a t i o n o f the Magnetic Needle.
483
The bees work and deposit their honey in drawers. When these, or any of them, are fall, or it is desired to obtain honey, one or more of them may be taken out, the bees allowed to escape into the other part of the hive, and the hone~y taken away." The glass doors allow the working of the bees to be observed; and it is added that the spaciousness, cleanliness, and the even teh~perature of tim habitations provided tbr them in this manner, render them the more industrious, r~m. ~ ,
Caoutchouc Itose. An interesting experiment took place on board the powerful floating engine belonging to the London Assurance Corporation, the other day, in the presence of the directors, to ascertain the strength of a newly invented hose made of caoutchouc, or India rubber. A length of leather hose and one of India rubber were attached to the engine, each furnished with a branch tightly corked. On working the engine for a short time the leather hose, unable any longer to resist the accumulated pressure, burst in the solid part of the leafl]er, while the India rubber hose remained firm and uninjured; and the engine itself became disabled by the breaking of one of its cranks, without producing any effect upon the elastic material of which the new hose is constructed. Mining Journal.
Effects of Sea=water on Iron. Iron, after remaining a long time submerged in the sea, is converted into plumbago. As an evidence of this change, M. Eudes Deslongchamps has lately presented to the Linn~ean Society of Normandy some cannon balls taken from the bottom, off Cape le Hogue, which were sunk with the ships under Admiral Tourville, in 169~. They do not at first sight appear to have undergone any change; but when examined, are found to have lost two-thirds 5f their weight, and may be scraped or cut with a knife, like black lead. They contain no remains of their original ferruginoas qualities, and have not the least etl~ct upon the loadstone or magnetic needle. Ibid
Twisted Metallic Wire. An experiment took place in the Chain Cable Proving-house, Woolwieh Dock-yard, before Rear-Admiral Sir W. Parker, upon a specimen of rope made out of twisted metallic wire; it snapped, however, upon the first application of tension. Ibid.
Variation oaf the Magnetic ,Needle, at London, .Dec., 18S6. If inquiry be made for the accurate amount of the present variation of the magnetic needle at London, it is remarkable how difficult it is to obtainanything like a satisfactory answer. A valuable correspondent has enabled us to make the following communication. "On December the 14th last, I found, by equal altitudes, with a good instrument, that the variation was 2S ° $7' SO" West. " Fleet street, Feb, 25, 18S7." ~ag. roy. sci.
483
The bees work and deposit their honey in drawers. When these, or any of them, are fall, or it is desired to obtain honey, one or more of them may be taken out, the bees allowed to escape into the other part of the hive, and the hone~y taken away." The glass doors allow the working of the bees to be observed; and it is added that the spaciousness, cleanliness, and the even teh~perature of tim habitations provided tbr them in this manner, render them the more industrious, r~m. ~ ,
Caoutchouc Itose. An interesting experiment took place on board the powerful floating engine belonging to the London Assurance Corporation, the other day, in the presence of the directors, to ascertain the strength of a newly invented hose made of caoutchouc, or India rubber. A length of leather hose and one of India rubber were attached to the engine, each furnished with a branch tightly corked. On working the engine for a short time the leather hose, unable any longer to resist the accumulated pressure, burst in the solid part of the leafl]er, while the India rubber hose remained firm and uninjured; and the engine itself became disabled by the breaking of one of its cranks, without producing any effect upon the elastic material of which the new hose is constructed. Mining Journal.
Effects of Sea=water on Iron. Iron, after remaining a long time submerged in the sea, is converted into plumbago. As an evidence of this change, M. Eudes Deslongchamps has lately presented to the Linn~ean Society of Normandy some cannon balls taken from the bottom, off Cape le Hogue, which were sunk with the ships under Admiral Tourville, in 169~. They do not at first sight appear to have undergone any change; but when examined, are found to have lost two-thirds 5f their weight, and may be scraped or cut with a knife, like black lead. They contain no remains of their original ferruginoas qualities, and have not the least etl~ct upon the loadstone or magnetic needle. Ibid
Twisted Metallic Wire. An experiment took place in the Chain Cable Proving-house, Woolwieh Dock-yard, before Rear-Admiral Sir W. Parker, upon a specimen of rope made out of twisted metallic wire; it snapped, however, upon the first application of tension. Ibid.
Variation oaf the Magnetic ,Needle, at London, .Dec., 18S6. If inquiry be made for the accurate amount of the present variation of the magnetic needle at London, it is remarkable how difficult it is to obtainanything like a satisfactory answer. A valuable correspondent has enabled us to make the following communication. "On December the 14th last, I found, by equal altitudes, with a good instrument, that the variation was 2S ° $7' SO" West. " Fleet street, Feb, 25, 18S7." ~ag. roy. sci.