THE following catalogue of apparatus has been introduced, not so much to show where such instruments can be obtained, as to answer the frequent inquiry, What assortment of philosophical apparatus would be well adapted to our school or academy, and what would it cost? In the lists have been marked such articles as constitute a well-arranged set of apparatus; affording as many, if not more important illustrations in these branches of science than can be obtained by any other combination of instruments or sets of apparatus comprising the same number of articles. The economy of the selection and arrangement will be understood and appreciated by those familiar with the use of philosophical instruments, when we say that no less than twenty of the pneumatic instruments, in set marked 3, for two hundred and fifty dollars, may be used in connection with the electric, adding some thirty-five good experiments in the latter branch of science; while some fifteen of the pneumatic and several of the electric instruments may be transferred to, and used in connection with, the chemical apparatus, increasing considerably the number and importance of the experiments. It will be seen that the sets are composed chiefly of such instruments as are absolutely essential to give a ready and clear illustration of the principles designed to be taught; that is, a machine is not employed when the idea can as well be given on the blackboard. On this point we find a great difference of opinion; while one requires an apparatus, or fixture for each experiment, and thinks that a very incomplete assortment which does not include at least one instrument for each illustration, another perfects many experiments with a single instrument, or at least, secures three, four or more complete illustrations by the use of two simple instruments. In the selection of instruments composing the several sets, it has been sought to multiply experiments by bringing together such branches of science as admit of the instruments in each being properly constructed, and yet well adapted for illustrations in other departments of science; for instance, with a well arranged set of pneumatic apparatus we have many instruments with which to effect not a few fine experiments in chemistry, electricity, &c. This may account for the seeming undue prominence given to these branches of science in making up of sets. We have little reluctance in offering to the notice, even of the common schools of our country, apparatus composed of such a variety of instruments, since the opinion now prevails, that the instructor should not only have the instruments, but possess the practical skill requisite to their proper use in illustrating and applying the principles of natural science. The numbers and figures following refer to "Chamberlain's Illustrated Price Catalogue of Philosophical Instruments," "Electric Illustrations and Experiments," "Illustrated Catalogue of Chemical Apparatus," "Pneumatic Experiments and Illustrations," &c., in which a description of the instrument is given, with some two hundred and fifty experiments in pneumatics and hydrostatics, and some in electrics. "Francis's Chemical Experiments" (more than two thousand experiments) will be found a valuable accompaniment of the chemical apparatus ; while "Davis's Manual of Magnetism" treats of galvanism and its kindred topics, giving a list of experiments and illustrations which commend it to all who would avail themselves of the aid afforded by the experience of a scientific mechanic. We may here state that the apparatus marked 3, has been furnished by Mr. Chamberlain to the following grammar schools in the city of Boston, at a cost of about two hundred and fifty dollars each set. The instruments marked 4 are such as have been approved and used in high schools and academies-cost about four hundred dollars and have been furnished to the Normal Schools of Massachusetts, and others. The instruments marked 6 compose a set for the larger schools and academies, and have been furnished, among others, to the Putnam Free School, W. H. Wells, Principal, Newburyport, Mass.; Central High School, E. Smith, Principal, Cambridge, Mass.; High School, Worcester, Mass.; Monson Academy, Rev. C. Hammond; High School, New Bedford, Mass.; Boys' High School, Salem, Mass.; and to schools and academies in Providence, R. I., Philadelphia, Pa., Wilmington, Del., Hartford, Conn., Auburn, Ala., Burlington, N. J.; Williston Seminary, Easthampton, Mass. 6. Figs. 3 & 4. A set of eight illustrations for centre of gravity, ... ..... Price. Mechanical Powers, larger size, with five sets large size pulleys; brass weights from 1 to 48 oz., two of each; wheel and axle, has seven graduations, and runs on friction rollers, $50 00 Mechanical Powers, arranged in rosewood frame, brass levers; brass wheel with steel axle, has gear and endless screw and crank attached to the wheel and axle; is in all respects a highly finished apparatus, ..100 00 Hunter's Screw, in frame,..... 6 00 NOTE. The straps to all the pulleys are unlike those generally used with philosophical 7. Fig. 5. Table with Spring Pistols and Ball, illustrating compound forces, &c. 6 00 & 8 00 instruments. They are of cast brass, tastefully 8. Fig. 6. Whirling Machine, with eight illustrations of central and centrifugal for ces,.... 9. Fig. 7. Atwood's machine for the laws of falling bodies, swelled and finished, and enclose the pulleys, which turn on small steel pins, and are separated one from the other by partitions, which not only sustain the centre pin, but prevent 78 00 the difficulty which occurs from the cords running off. 50 00 & 100 00 10. Fig. 8. A set of Mechanical Powers arranged in a mahogany frame three and a half feet long and three feet high; each lever is eighteen inches long; four sets of pulleys strung with silk cord and well balanced; brass weights from 1 to 16 ounces; screw and lever with nut; screw as an inclined plane; ship capstan; wheel and axle; wedge in two parts; inclined plane with carriage; movable fulcrum and lever, for combining the power of screw and lever,23 6735 00 opaque objects; a large condensing lens and other fixtures in keeping with a first a polished velvet lined mahogany case,........ Price 850 00 25. Telescope, large size; 47 inch brass tube; 3 inch achromatic object glass; one eyepiece for Terrestrial and two for Celestial objects; rack and pinion adjustment for eye-piece; cased as No. 24; a superior and cheap instrument, at... ..150 00 26. Fig. 16. Reflecting Telescope, five and a half feet long, mounted five and a half feet high on tripod stand, with vertical and horizontal motion by micrometer-gear and pinion, as represented in the cut, seven inch reflector; three small reflectors; three eye-pieces and Finder,300 00 27. Fig. 18. School Orrery, motion given by a crank,........ 17 00 School Orrery, larger size, better finish,motion given to the moon around the earth,. #10 00 ... rate instrument,... .... 25 00 28. Fig. 19. Spring Orrery, gold gilt 22. A large tripod-mounted Compound Microscope, with horizontal joint; six powers, twenty-four objects, and eighteen pieces for general use with the instrument,... 42 00 There is accompanying, an accurate copperplate, illustrative of each micro- 29. scope, with all its parts, and a minute description of their uses. 23. Models of the Human Eye, in three parts,. Fig. 11. The Eye in all its parts, (is four inches in diameter,) and dissectible, showing the Cornea, Iris, Ciliary Process, Choroid Tunic, Crystalline Lens, Vitreous Humor, Retina, Black Pigment, Optic nerve, &c. Fig. 12. The Eye in its socket with the muscles. Fig. 13. The Eye with rays of light passing from an object and forming the image on the retina. The object and image are movable, showing the cause of "long sight,' ""short sight," and "6 perfect sight." Fig. 14. Section view of Fig. 11. ASTRONOMY, &c. 24. Fig. 15. Astronomical Telescope on brass stand, 2 1-4 inch achromatic object glass, two eye-pieces or powers and sun-glasses, forty-six inches long, with four draws out, in ..12 00 30. planets; brass arms; 5 inch sun; stands two feet high; spreads 3 feet from Herschel to Saturn; motion to the moon round the earth, 6" 25 00 If motion is given to Jupiter's moons, 35.00 45 00 Fig. 20. Spring Orrery; brass mounted; extra finish; motion as above,.. Fig. 21. Seasons Machine, with five inch sun and three inch earth; motions all correct; giving the earth on its axis, round the sun, inclination to the north, aphelion and perihelion position; moon round the earth; moon's nodes; sun on his axis, &c., &c.,... 12677 & 12 00 31. Fig. 22. Chamberlain's improved high mounted Globes, 13 inch diameter; stands 48 inches high, on iron legs, neatly bronzed, with castors; the pedestal or pillar is of mahogany, and receives the hub and shaft on which the Globe is mounted. This arrangement admits of a horizontal rotary motion to the whole globe, meridian and horizon. Price per pair,740 00 32. Thirteen inch Globes, low mounted; pair,........ 33. Ten inch Globes, high mounted, pair,.. .630 00 .630 00 18.00 34. Ten inch Globes, low mounted, pair, 35. Six inch Globes, low mounted, pair,... ....10 00 SLIDER VIII. SLIDER II. Scaly-breasted ParakeetGreen Toucan-Rhinoceros Bird. SLIDER III. Newfoundland Dog - Wolf - Striped Vaillantian Bird of Paradise SLIDER IX. throated Humming Bird- SLIDER IV. RedSummer SLIDER XI. Ichneumon and Civet Cat- Polecat and White Stork Ferret chilli. Otter Polar Bear Common Bear SLIDER XIII. SLIDER VI. Common Ostrich-Southern Apteryx- |