Publisher's Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1852 edition. Excerpt: ...to point out how far the list of expected Philosophical Instruments has been realized. The following list is a copy of that drawn up by Dr. Playfair, and printed in the "Official Catalogue: " PHILOSOPHICAL INSTRUMENTS. DR. PLAYFAIR'S CLASSIFICATION. Instruments For Measuring Of Space. 1. In fixed Observatories, as Transits, Transit Circles, Great QuadrantB, Mural-Circles, Zenith Sectors, Altarimeters, Equatoreals, Collimators, &o. 2. For Nautical Astronomy and Observations, as Sextants, Reflecting and Repeating Circles, Dip Sectors, &c. 3. Astronomical and Topographical Illustrations, as Globes, Orreries, Planetariuins, Maps, Charts. 4. Optical Instruments, as great Refracting and Reflecting Telescopes, with their appurtenances, Equatoreal Motions, &c. 5. Apparatus subordinate to Graduated Instruments, as divided Object-glasses and Heliometers, Eye-pieces, Micrometers, Micrometer Microscopes, &c. 6. Survey Instruments, Topographical, as Base Apparatus, Theodolites, Repeating Circles, Geodetic Signals, Levelling Apparatus, Miners' and Prismatic Compasses, Pocket Sextants, Perambulators, Pedometers; 'Hydrographical) as Sounding Machines, Patent Logs, Current-meters, Silometers. Instruments To Measure The Effects Of Mechanical And Physical Forces. 1. Mechanical, as Dynamometers, Tachymeters. 2. Mass-weighing Instruments, as Weighing Machines, Scales, Chemical, and Assay Balances.' 3. Density, as Areometers and other Instruments to de termine specific gravity, Invariable Pendulums, Atwood's Machine. 4. To measure other physical effects, including Meteoro logical Instruments, as Barometers, Hydrometers, Eudiometers, Thermometers, Pyrometers, Electro-meters, Rheometers, Magnetometers, &c. Relief or Model...
