Chain survey Cross staffFrench cross staff Adjustable cross staff Offset instrument

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HII STUDENTS , • ...........................I AM BALVEER SINGH NAYAK . • Dear students :- • If my lectures are helpful to you please do support and encourage me to do many more civil engineering videos ( UPPSC, UPSSSC JE, SSCJE, RRB JE,....ETC)...Hope my classes are helpful for your preparation ...do PAY .......through ... .( Paytm.( 9675380602) or account no- 27140100013124.....IFSC code- BARB0BLYGHA.....(fifth character is zero)..... ..) ..as per your wish ....for further development of my channel . • .......... if not please ignore ........ • THANK YOU FOR YOUR SUPPORT ...","styleRuns":[{"startIndex":0,"length":611,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":611,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"continuationItemRenderer":{"trigger":"CONTINUATION_TRIGGER_ON_ITEM_SHOWN","continuationEndpoint":{"clickTrackingParams":"CKgBELsvGAIiEwipysSb1-6LAxWy0UIFHbEiJ2g=","commandMetadata":{"webCommandMetadata":{"sendPost":true,"apiUrl":"/youtubei/v1/next"}},"continuationCommand":{"token":"Eg0SC2dsN1IycVJDaWtjGAYyJSIRIgtnbDdSMnFSQ2lrYzAAeAJCEGNvbW1lbnRzLXNlY3Rpb24%3D","request":"CONTINUATION_REQUEST_TYPE_WATCH_NEXT"}}}}],"trackingParams":"CKgBELsvGAIiEwipysSb1-6LAxWy0UIFHbEiJ2g=","sectionIdentifier":"comment-item-section","targetId":"comments-section"}}],"trackingParams":"CKcBELovIhMIqcrEm9fuiwMVstFCBR2xIido"}},"secondaryResults":{"secondaryResults":{"results":[{"compactVideoRenderer":{"videoId":"bdgDlKLleMo","thumbnail":{"thumbnails":[{"url":"https://i.ytimg.com/vi/bdgDlKLleMo/hqdefault.jpg?sqp=-oaymwEbCKgBEF5IVfKriqkDDggBFQAAiEIYAXABwAEG rs=AOn4CLATzssKma_B4dhhb5X6WgFwqJ2ZTA","width":168,"height":94},{"url":"https://i.ytimg.com/vi/bdgDlKLleMo/hqdefault.jpg?sqp=-oaymwEcCNACELwBSFXyq4qpAw4IARUAAIhCGAFwAcABBg== rs=AOn4CLC2cNrzifAoAXvdhtl0YPnXPWGXWA","width":336,"height":188}]},"title":{"accessibility":{"accessibilityData":{"label":"Cylindrical optical square ! offset instrument ! 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