. American school of correspondence; a technical school for mechanics giving exclusive attention to steam and electrical engineering and the construction and operation of machinery. Fig. 14. ^ The Daniell Cell has a copper plate immersed in a saturated solution of copper sulphate (blue vitriol) and a zinc plate immersed in dilute sulphuric acid or a solution of zinc sulphate (white vitriol). Sometimes one of the liquids is contained in a porous cup placed in the other liquid. The solution of copper sulphate is kept saturated by cr3^stals of copper sulphate placed in the solution. The current f
. American school of correspondence; a technical school for mechanics giving exclusive attention to steam and electrical engineering and the construction and operation of machinery. Fig. 14. ^ The Daniell Cell has a copper plate immersed in a saturated solution of copper sulphate (blue vitriol) and a zinc plate immersed in dilute sulphuric acid or a solution of zinc sulphate (white vitriol). Sometimes one of the liquids is contained in a porous cup placed in the other liquid. The solution of copper sulphate is kept saturated by cr3^stals of copper sulphate placed in the solution. The current from this cell is nearly constant. Polarization ^^__^^^^^ is avoided by the copper being deposited, !•<• )•• instead of hydrogen, upon the copper plate^ When not iu use it should be kept on closed MECHANICAL DRAWING. LESSON Study of Projections. When designing any object such as a jnece of machinery it isnecessary that several representations of it should be (h-awn in orderthat, by knowing exactly all of its dimensions, we may be able toreproduce it; these various views are generally known affront andside elevations and plans, and are end)ra<,ed under the generalterm oi projections. The object of the study of projections is to enable one to makean exact representation on paper of the several dimensions of abody as they appear on its various sides. It is convenient to make the projections of any body what-soever, upon two principal planes, one of which is called the Jiori-zontal plane and the other the vertical plane. These two planesare also called geometrical planes or planes of projectioi. The line of intersection which separates these two planes isknown as the base line; this line is always horizontal and indesigning we invariably suppose it to be parallel to one of
Size: 921px × 2713px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherbostonmass, booksub
