B.Extract the lead from the sample of galena A supplied. The weight of the galena used, and of the lead obtained, must be stated in your paper. (25) Note. The candidate must place the number of his examination paper on the products he obtains in both cases. He is to hand them to the Superintendent of the examination, to be returned to the Board of Education, South Kensington. Particulars of the methods he has used must be given in his paper. Stage 1. DIVISION 2. Read the Instructions on page 176. Four hours are allowed for this examination. AA.-Prepare an alloy of the following composition from the materials supplied : The weight of each metal used, and of the alloy obtained, must be stated in your paper. The alloy must be cast in an ingot mould, so that it can be broken to show the fracture. BB.-Extract the lead from the sample of galena B supplied. (25) The weight of the galena used, and of the lead obtained, must be stated in your paper. (25) Note. The candidate must place the number of his examination paper on the products he obtains in both cases. He is to hand them to the Superintendent of the examination, to be returned to the Board of Education, South Kensington. Particulars of the methods he has used must be given in his paper. Stage 2. DIVISION 1. Five hours are allowed for this examination. C. Extract the copper from the cupriferous slag supplied. The weight of the slag used and of the copper obtained must be stated in your paper. (50) D. Make a monosilicate slag containing 10 per cent. CaO with the materials supplied. The weight of each of the materials used and of the product obtained must be stated in your paper. (50) Note. The candidate must place the number of his examination paper on the products he obtains in both cases. He is to hand them to the Superintendent of the examination to be returned to the Board of Education, South Kensington. Particulars of the methods he has used must be given in his paper. Stage 2. DIVISION 2. Five hours are allowed for this examination. CC.-Extract the copper in the form of "white metal" from the sample of copper refinery slag supplied. The weight of the slag used, and of the "white metal" obtained, must be stated in your paper. (50) DD.--Make a monosilicate slag from the materials supplied which shall have the composition CaFeSiO4. The weight of each of the materials used, and of the product obtained, must be stated in your paper. (50) Note. The candidate must place the number of his examination paper on the products he obtains in both cases. He is to hand them to the Superintendent of the examination, to be returned to the Board of Education, South Kensington. Particulars of the methods he has used must be given in his paper. Stage 3. Details of all weighings made must be recorded on your paper. Eight hours are allowed for this examination. Every weighing made must be recorded, otherwise the paper is liable to be cancelled. E.-Determine the percentage of magnesia in the dolomite supplied. (75) Each candidate must undertake the above task, E, and one, but not both, of the following tasks, F and FF. F.-Determine the percentage of tin in the "bearing" metal supplied. (75) FF.-Determine the percentage of silver in the speise supplied. (75) Note. The candidate must place the number of his examination paper on a packet containing the silver he obtains in FF. He is to hand it to the Superintendent of the examination, to be returned to the Board of Education, South Kensington. Particulars of the methods he has used must be given in his paper. The Honours Examinations in Subjects XIX. and XIXP. are amalgamated (see pages 171 to 176). SUBJECT XX. NAVIGATION. INSTRUCTIONS. Read the General Instructions on page 3. Mathematical tables, without any treatise, may be used, and by Candidates taking Stage 3 or Honours, the Nautical Almanac for the current year may also be used; otherwise you may not have with you any books, notes, or paper other than that supplied for use at this examination. to you On the first page of your answers write the name of the Book of Tables you use. Stage 1. You are permitted to answer only eight questions, viz., four out of each of the sections into which the paper is divided. The examination in this subject lasts for three hours. SECTION I. 1. Explain the terms: Equator, Meridian, Parallel of Latitude, Latitude and Longitude of a place on the Earth. A ship sails on a parallel of latitude from longitude 40° W. to 75° W. How much longer would the voyage be if made on the parallel of 35° N. than of 50° N.? (14) 2. What corrections have to be applied to the Compass Course to convert it into a True Course, and why are they necessary? The north point of a compass sent ashore at Valparaiso pointed N. 15° E., and when the compass was returned to the ship it set N. 8° E.; what conclusions would you draw as to the amount of Variation and Deviation respectively? (10) 3. Show how the local time at a place depends upon the longitude of the place. What is the time at Mauritius in longitude 58° E. when it is 7h 30m P.M. at Greenwich? (12) 4. Describe generally the methods of obtaining soundings in deep and shallow waters respectively. (12) 5. By Dead Reckoning a ship was in lat. 37° 50' N., long. 41° 52′ W. By observations her position was lat. 38° 1' N., long. 42° 5' W. Apply the Traverse Table to find the set and drift of Current. (12) 6. Explain what is meant by Middle Latitude, and state and prove the formula employed in this method of computation. SECTION II. (12) 7. A ship steamed at the rate of 12 knots from Albany (lat. 35° 3' S., long. 118° 2′ E.) to Cape Catastrophe (lat. 35° 3' S., long. 135° 58′ E.). How long did she take on the voyage? (10) 8. Find the true course and distance from Funchal (lat. 32° 37' N., long. 16° 54′ W.) to Gibraltar (lat. 36° 7′ N., long. 5° 21′ W.). (8) 9. A ship sailed from Port Elizabeth (lat. 34° 7′ S., long. 25° 40′ E.) S.E.S., until her departure was 397'; find her position at the time. (12) 10. Find the compass course and distance from Syracuse (lat. 37° 3' N., long. 15° 15′ E.) to Fano (lat. 43° 50′ N., long. 13° 7' E.). Variation 13° 40′ W., Deviation 6° 50′ E. (12) 11. A ship left a position from which Cape Clear (lat. 51° 26' N., long. 9° 29′ W.) boře N.E. by E. 12.5 miles distant, and sailed South 150' and then West 290 miles. Find the bearing and distance of Cape Clear from the ship in her last position. (12) 12. Cape Ortegal (lat. 43° 45' N., long. 7° 6' W.) bore S.W. W. 12 miles distant. Afterwards sailed as under : Stage 2; Stage 3 and Honours in Navigation and Spherical and Nautical Astronomy. You may take Stage 2, or Stage 3, or, if eligible, Honours, but you must confine yourself to one of them. The examination in this subject lasts for three hours. Stage 2. You are permitted to answer eight only of the questions, viz., four out of each of the sections into which the paper is divided. SECTION I. 21. Define Departure, and Meridional Difference of Latitude, and prove the formula Diff. Long. = Dep. Mer. Diff. Lat. True Diff. Lat. When may the expression = Diff. Long. Departure x sec Mid. Lat. be substituted for the first formula, without appreciable error ? (25) 22. In the construction of a Mercator's Chart if the Meridional Parts for 1° have been determined, write down the expression which will give the Mer. Parts for 1° + 5'. The Mer. Parts for 48° 55′ being 3374 47, find the M.P. of 48° 49'. (20) 23. In the construction of a Mercator's Chart the degree of latitude from 48° to 49° is represented by 3 622 inches, find the scale adopted for the degree of longitude. (25) 24. Explain the construction and use of the Traverse Table. Show how the Traverse Table may be employed to find by inspection the approximate course and distance from A to B. 25. What is meant by Great Circle Sailing? In what parts of the world is the saving in distance effected by means of it most marked? Describe the modification known as Composite Great Circle Sailing. (20) 26. Explain the term: Transient Induced Magnetism. If a bar of soft iron, held in a vertical position, is carried round a compass needle: describe the effects produced (a) in north and (b) in south latitude. (25) |