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" To make the index glass, I, perpendicular to the plane of the limb, bring the vernier to about the middle of the arc and examine the arc and its image in the index glass. If 'the glass is perpendicular to the plane of the limb, the image of the reflected... "
Surveying Manual: A Manual of Field and Office Methods for the Use of ... - Page 147
by William David Pence, Milo Smith Ketchum - 1915 - 388 pages
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A Text-book of Plane Surveying

William Galt Raymond - Logarithms - 1896 - 524 pages
...and observe the arc near the zero point directly, and the reflected image of the other end of the arc in the index glass. If the glass is perpendicular to the plane of the limb, the reflected and direct portions will seem to form one continuous arc. Adjust the glass, if necessary,...
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A Manual of Field and Office Methods for the Use of Students in Surveying

William David Pence, Milo Smith Ketchum - Surveying - 1901 - 272 pages
...be used for measuring small angles between objects near at hand. Adjustments, Iiidc.t: (/1«*x. — To make the index glass, I, perpendicular to the plane...base. Horizon Glass. — To make the horizon glass, H, parallel to the index glass, I, for a zero reading. With the vernier set to read zero, sight ait a...
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A Manual of Field and Office Methods for the Use of Students in Surveying

William David Pence, Milo Smith Ketchum - Surveying - 1904 - 282 pages
...perpendicular to the plane of the limb, bring the vernier to about the middle of the arc and examine the aro and its image in the index glass. If the glass is...base. Horizon Glass. — To make the horizon glass, H, parallel to the index glass, I, for a zero reading. With the vernier set to read zero, sight at a star...
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Engineer Field Manual...: I. Reconnaissance. II. Bridges. III ..., Volume 6

United States. War Department - Military field engineering - 1912 - 524 pages
...opening. The adjustments are as follows: For the index glass, place the vernier at ahout 30° of the limh and examine the arc and its image in the index glass. If the arc and image appear continuous, the glass is in adjustment. If the image appears ahove the arc, the...
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Engineer Field Manual...: I. Reconnaissance. II. Bridges. III ..., Volume 6

United States. War Department - Military field engineering - 1912 - 580 pages
...opening. The adjustments are as follows: For the index glass, place the vernier at about 30° of the limb and examine the arc and its image in the index glass. If the arc and image appear continuous, the glass is in adjustment. If the image appears above the arc, the...
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Professional Papers, Issue 29

United States. Army. Corps of Engineers - 1912 - 580 pages
...opening. The adjustments are as follows: For the index glass, place the vernier at about 30° of the limb and examine the arc and its image in the index glass. If the arc and image appear continuous, the glass is in adjustment. If the image appears above the arc, the...
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A Manual of Field and Office Methods for the Use of Students in Surveying

William David Pence, Milo Smith Ketchum - Surveying - 1914 - 282 pages
...perpendicular to the plane of the limb, bring the rernier to about the middle of the arc and examine the arn and its image in the index glass. If the glass is...Adjust the glass by means of the screws at the base. llwizon Glass. — To make the horizon glass, H, parallel to the index glass, I, for a zero reading....
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Plane Surveying for Use in the Classroom and Field

William G. Raymond - Surveying - 1914 - 622 pages
...and observe the arc near the zero point directly, and the reflected image of the other end of the arc in the index glass. If the glass is perpendicular to the .plane of the limb, the reflected and direct portions will seem to form one continuous arc. Adjust the glass, if necessary,...
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Surveying Manual ; a Surveying

William David Pence - 1915 - 416 pages
...not be used for measuring small angles between objects near at hand. Adjustments, Index Glass.—To make the index glass, I, perpendicular to the plane...glass by means of the screws at the base. Horizon Glass.—To make the horizon glass, H, parallel to the index glass, 7, for a zero reading. With the...
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Engineer Field Manual ...: I. Reconnaissance. II. Bridges. III ..., Parts 1-7

United States. War Department - Fortification, Field - 1917 - 576 pages
...adjnetnicutH are as follow»: For the index к!аяя, place the vernier at about 30° of the limb and examine the arc and its image in the index glass. If the arc and image appear continuous the glass is in adjustment. If the image appears above the arc the...
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