Message from the President of the United States to the Two Houses of Congress Volume 32-33
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1854 edition. Excerpt: ... rings (of tin) soldered to each. On the end of the iron bar, near the connecting piece, is screwed a piece of iron to which is attached a sector bearing a level seven inches in length, moved by means of a tangent screw whose head projects through the top of the tin case. Thescale of the sector, and the scale of its attached level serve, together, to indicate the inclination of the bars. The sector bears on its upper part a contact level hanging in steel pivots, and having below a small projecting arm of steel for contact. To the lower part of the sector is attached a piece in the shape of a V, bearing a lever with its pivot at the apex of the V; this lever has at its upper end a hardened steel screw passing through' 'it and abutting against the small projecting arm of the contact level. Jnst below this gas tubing, with cast iron connecting pieces above and below. In the centre of these is fixed a 2%-inch iron tube nearly two feet long, with a two-inch sliding tube within it, moved by a rack and pinnion, having an outside crank and a catch to stop it at any desired height. Within this is an iron barrel turning on a steel axis, and on the upper part of the barrel is a broad flange with a level cog wheel, to which a rotary motion can be given by means of a smaller cog wheel put within reach of the operator by a long handle reaching beyond the rear end of the tube. This allows a perpendicular motion of about two inches, and is intended for final adjustment of the tube in altitude; the large motion being-given by the rack and pinions. Two sliding plates of nine inches in length, with a top plate of six inches, with their screw arrangements, give the necessary lateral and longitudinal motion; also, by means of long handles...
- Paperback | 256 pages
- 189 x 246 x 14mm | 463g
- 13 Sep 2013
- Illustrations, black and white