100) If the intercept on a vertical staff is ob-served as 0.75 m from a tacheometer, the horizontal distance between tacheometer and staff station is

101) For a tacheometer the additive and multi-plying constants are respectively

102) If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

103) Overturning of vehicles on a curve can be avoided by using

104) Different grades are joined together by a