Items related to The Emporium of arts & sciences Volume 1
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1812 edition. Excerpt: ... wood destined to be exposed to mutual friction. Cviinders.Tablet.Duration.Effect. Box wood--Box--5 min.Sensible heat. Ditto Ditto--Poplar--Oak--Ditto DittoDitto Ditto Ditto--Mulberry3--Considerable heat and smoke Ditto--LaurelDittoDitto Laurel-Ditto Ivy--Ditto--Poplar--Ivy----Box--2--Ditto 3--DittoDitto Ditto Ditto Ditto--Walnut-Olive--Olive--DittoDitto Mulberry--Laurel2--Consid. heat, smoke, and blackness Ash----Oak--5--Sensible heat ' Ditto--Fir--DittoDitto Pear-tree--Oak--DittoDitto Cheny-Plum Oak-v--Elm--Ditto Ditto DittoDitto Ditto Ditto--Apple-tree--Fir--Changing the experiment, and rubbing a cylinder of one of the kinds of wood between two tablets of the other, a cylinder of poplar for example between two tablets of mulberry wood, the increase of the rubbed surfaces which are in contact with the air produced a heat much more considerable, and almost the whole of the kinds of wood above enumerated took fire. The effect of friction still varies according as the woods employed, especially if they are of the same kind, are rubbed in the direction of the fibres, or when the fibres cross each other. In the first case, the friction and heat are much more considerable than in the second. In large machines where there is much friction, heating may be prevented by continually directing a current of cold water on the rubbing surfaces: in common machines, carriages, &c. it is diminished by covering the surfaces with an oily matter. There are many instances, during the great heats in summer, of carriages and other machines exposed to violent motion inflaming, because care has not been taken to grease them. Grease, by hardening on the rubbing surfaces, instead of lessening the friction increases it; and as this covering is highly combustible, it...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 0217948723
- ISBN 13 9780217948722
- BindingPaperback
- Number of pages142
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