Calendar: 1887-1888 Page 689

APPLIED SCIENCES 693 FIRST YEAR As an acre contains 10 square chains prove that the length of the chain must be 66 feet Explain the methods that have been shown you in the Field for erecting perpendiculars passing obstructions and carrying on the chainage of line across river or pond What are 1st the Prismatic Compass 2nd the Box Sextant Describe the construction and adjustments of the Cir- 'cumferentor and of the Theodolite and the purposes for which they are respectively used How are Areas taken out by Ordinates The following are reduced levels and distances Make sketch of the section with the gradients between the points Height above Base Distance 35-70 000 י 40-20 3-50 43 50 5-30 3910 8-50 Complete the Field Book from the following levels and make sketch of the section that would be plotted therefrom