US90025A - Improvement in iievelling-staff - Google Patents

Description

` To alhwhom "it mq/y concern:`

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WILLIAM H. ROBINSON, or VERMONT, ILLINOIS.v i ""Lezars'rom No. 90,025, mamy 11,1869. i

IMPROVEMENT m LEvELLrNG-s'rarr.

V The Schedule referred to in theseiLettei-s Patent and making part of the same. ,y

1Be `it Yknown that I, WILLIAM H.'RoB1NsoN,'of

Vermont, in the `county of Fulton, and State of Illinois, have invented a new and valuable Improvement in Levelling-Rods, (device `for cross-sectioning earthworkg) `and I do hereby declare that thefollowing is a full, clear, and exact description of the construction and operation of the same, reference being had to' the annexed drawings, making apart of this specication, and tothe letters and figures of reference marked thereon. Y l

Figure 1,0f the drawings, is a representation of the rod, `s lowing the face and' the side, which is used as anY or inary levelling-rod. v

Figure 2 is a representation of the rod, showing the backand the side, opposite the oneused in ordinary levelling. y i ,4 y

Figure `3, a pulley, one of which is attached 'to each end of the rod. r

My mode of constructing the rod is as follows:

I` take a straight rod of light wood, aboutone 4and a quarter nchthick, two inches wide,`and twelveA feet long, and,v in order to make it as light as possible without diminishing the ,-widtb, I make it hollow. f

A'pulley,.fig. 3, is attached to each end of the rod'. A band of leather, or some other flexible non-elastic material, of thesame width as andtwicethe length of the rod, isl passed over the pulleys, drawn perfectly tight, and the ends fastened rmly and smoothl y1 together, forming the face and back of the rod.

It istben painted white, and graduated into feet )and tenths of a foot.AV l Thegraduations on the fixed part of the rod, are numbered in a continuousseries, from the bottomup the side, (see iig. 1,) thence; down the-opposite side, (see iig. 2,) to the bottom. 1

The graduations on the movable part or band, are

numbered both ways, one series running from` the Zero or target down the face to `the bottom, (see fig. 1;) `thence up the back, (see iig. 2,) to the top; thence o down the face again, (see Iig. 1,) to the place of beginning. y

VThe `other series runs up Ithe rod, on the face, to the top, (see fig. 1;) thence down the back, (see fig. 2,)

Ato the-bottom; thence up the face, (see fig. 1,) to the` place of beginning, as before.`

` l The figure on the fixed part of therod, (see righthand ,sides of figs. 1 and 2,) representing tenths, are

painted black, and thoserepresentin'g feet are painted red. 3 v

The iigures on the bandy are also painted-'black and red, but the black figures represent tenths from the target, both ways, to twelve feet, or half the length v of the band,while the red ones represent feet, and from thence, around to the targetagaimthe black iigures represent feet and thegred ones tenths.

The manuel-.of using the rod is as follows:

Ascertain, by using the rod as an ordinary levelling rod, the height of the instrument, (the common engineers level,) above or below the given grade at the station where the observations'are to be made, and set the target or 'zero accordingly.

The'nnmberon the face of the rod which coincides with the line of eollimation of the instrument, is then the cut or fill, as the case may be, at that station.

, If the number is` below' the target, it represents a cut, and if -it isabove the target, it represents a fill.

If the instrument is morev than twelve feet, or the length of the rod above grade, the target should be set by the figures on the side of the rod, opposite to the side used in ordinaryT levelling.' (See right-hand side of iig. 2.) Itshould lbe on the bank of the rod. y

The above rule is somewhat xnollied by the following, which the operator should be careful ,to remember: When the target is on the face of the rod, the black son ofthe instrument being more than twelve feet, or

thelength of the rodl above grade, the numbers run l ningvfrom the top of thel rod downward, are the only ones noticed, and they invariably represent a cut.

When the target is on the back of th-rod, by reason ofthe instrument being below grade, the numbers running from the bottom of the rod upwards, are the' only ones noticed, and they invariably represent a fill.

1fv the instrument is more than the` length of the rod below, or more than twice the length of the rod above grade, the target may be set on the back of the rod, ten, twenty, or thirty feet,- as the case may be, less above or'below grade than the calculations show that it should be set, and the ten, twenty, or thirtyv `added to the numbersread from the rod.

What I claim as my invention, and desire to secure by Letters Patent, is

-A levelling-rod, having a travelling-band, as de-i scribed, moving around the same longitudinally, when `4 said rod and band"`a.re graduated and operate substantially as and for thepurposes specified.

In testimony thatfI claim the above, vI have hereunto subscribed my name, in'the presence of two witnesses.

`WILLIAM n. ROBINsoN.

Witnesses: Y

BALLARDHOBART, i

BENJAMIN ARMITAGE HATTERSLEY.

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iignres are the only ones noticed as representing the i

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