सर्वेक्षण (surveying) की निम्नलिखित में से किस विधि को आमतौर पर 'लूज नीडल विधि' (Loose Needle Method) कहा जाता है?

In surveying, an angle made by a survey line with the prolongation of the preceding line is known as a/an:

Which of the following is NOT a temporary adjustment performed on a Surveyor's compass?