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SYNOPTICAL TABLES.
| Lord Rosse's Great Reflector, focal length, in feet, | 54 |
| Lord Rosse's Great Reflector length of tube, in feet, | 56 |
| Lord Rosse's Great Reflector diameter of tube, in feet, | 7 |
| Lord Rosse's Great Reflector. weight of speculum, in tons, | 3 |
| Lord Rosse's Great Reflector. expense, | £12,000 |
| Cambridge, U.S., refractor, diameter of object glass, in inches, | 15.125 |
| Cambridge, U.S., refractor, length of tube, in feet, | 23 |
| Cambridge, U.S., refractor, magnifying powers, | 180-2000 |
| Cambridge, U.S., refractor, weight in tons, | 3 |
| Cambridge, U.S., refractor, diameter of declination-circle, in inches, | 26 |
| Cambridge, U.S., refractor, diameter of hour circle, | 18 |
| Cambridge, U.S., refractor, cost, | £4,000 |
| Object-glass by Clarke, diameter, in inches, | 18.5 |
| Object-glass by Clarke, diameter, contract price, | £2237 |
| Diameter of object-glass in process of execution by Cooke, in inches, | 24 |
THE END
BALLANTYNE AND COMPANY, PRINTERS, EDINBURGH.
