. Scientific American 74 Volume Numéro 14 (avril 1896). o la plantation de grands arbres f a été essayé très extensivelyin les différents pays, et le témoignage de tous les expertsis que, si c'est parfois réussi, c'est un verycostly encore insatisfaisante et transaction. Dans notre ownexperience, peut-être de trente grands arbres de différents types avec lesquels l'expérience a été tenté il y a quelques années, sometwenty avec soin et aliberal mopt abondants sans tenir compte de frais, l'un seulement est maintenant vivant,et qui n'est pas dans un très con-dition florissante. Prendre un jeune arbre d'une taille de la fil-suita pour transplanter, disons cinq ans

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. Scientific American Volume 74 Number 14 (April 1896). planting o f large trees has been tried very extensivelyin different countries, and the testimony of all expertsis that, while it is sometimes successful, it is yet a verycostly and unsatisfactory transaction. In our ownexperience, out of perhaps thirty large trees of differ-ent kinds with which the experiment was tried sometwenty years ago, with mopt abundant care and aliberal disregard of expense, one only is now living, and that not in a very flourishing con-dition. Take a young tree of a suita-ble size for transplanting, say fiveyears of age or thereabout, and atthe end of twenty years you will havea better result with it than you canhave with an old tree, and the youngtree will perhaps cost five dollarswhen planted, where the old one willcost five hundred. W^J^^. THE BOBINSON COBN AND FEED MILL. ing piece of apparatus which is used by him in his ex-periments. It consists of a dynamographic platformfor giving a curve of foot pressure on the ground atthe same time in which a mechanical record of themovement is obtained. Thedynamograph shown in theengraving consists of coils of India rubber tubing whichare more or less compressed according to the externalforce applied. In consequence of this pressure, thecontained air is more or less squeezed out into a cham-ber connected with the recording instrument. Thisportion of the apparatus is called a spiral dynamo-meter. In the complete apparatus a series of spiralsare arranged on an oak platform. All the tubes whichlead from the spirals unite in a common collectingtube, which communicates with the chamber of therecording tambour. A plate held in position byclips accurately covers all these spirals. When a manmounts this platform, the registering lever is raised toa variable height and remains in the sam

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• bookcentury1800
• bookdecade1890
• booksubjectcivilse
• bookyear1896