Excerpt from A School Compendium of Natural and Experimental Philosophy: Embracing the Elementary Principles of Mechanics, Hydrostatics, Hydraulics, Pneumatics, Acoustics, Pyronomics, Optics, Electricity, Galvanism, Magnetism, Electro-Magnetism, Magneto-Electricity, and AstronomyIN the year 1837, the school-committee of the city of Rosaio ordered a few articles of philosophical apparatus to be furnished for each of. The grammar-schools of that city, and the author of this work, who for many years had been at the head of one of those schools, finding no elementary work, unencumbered with extraneous matter, suitable to explain the apparatus, attempted to supply the deficiency. The result was the first edition of this work. A few years afterwards, the philosophical apparatus was exchanged for one of better construction, and much more extended application, 'and an enterprising publishing house in New Yorli induced the author to revise and extend his work. This was done in the year 1848. Since that time the progress of science has been so great that another revision is imperatively demanded, and the author, anxious not to be behind the age, has made another cai'eful revision, in which he is conscious of no omission in the notices of the present state of science, in the departments embraced in this volume, suitable for a work designed to be strictly elementary, and designed for these only whose progress in the exact science: must necessarily be limited. The Questions which have ap peered m previous editions he had no hand in preparing. Indeed, in his Opinion, such appendages to school-books, m the hands of experienced teachers, are of Very questionable expediency. But.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.