Page:Various Forces of Matter.djvu/201

 SUITABLE FOR THE EXHIBITION OF

JOHN J. GRIFFIN, F.C.S., begs leave to direct the attention of Lecturers on Experimental Science to his extensive Collection of Apparatus, adapted for the Exhibition of Popular Experiments illustrative of the leading: principles of Mechanical, Physical, and Chemical Science; particularly of


 * CHEMISTRY
 * HEAT
 * PNEUMATICS
 * HYDROSTATICS
 * MECHANICS
 * ELECTRICITY 
 * GALVANISM
 * MAGNETISM
 * ELECTRO-MAGNETISM
 * OPTICS

The Instruments can be supplied singly, or in sets adapted to specific Lectures, or (or the illustration of each particular Science. The collection embraces many of the instruments described in Dr. 's Lectures on the Various Forces of Matter.

* $$* A printed Catalogue may be had of a Series of Collections of Cheap Apparatus suitable for use in Elementary Schools. A set of these Instruments is exhibited in the South Kensington Museum.

PORTABLE CABINETS OF SCIENTIFIC APPARATUS.

Containing the materials for performing the Elementary Experiments of each of the Sciences. Chemical Cabinets at 12s., 313 6d., 428., 52s. 6d., and £5. 5s. Cabinets of Geological and Mineralogical Specimens at 52s. 6d. and £5. 5s. Cabinets of Electrical Apparatus at £3 3s. and £5. 5s. Collections of Shells, Tool Chests, &c.

ANALYTICAL CHEMICAL APPARATUS.

Apparatus for every Operation in Chemical Analysis, qualitative and quantitative, for Aasaying by the Muffle, and for Centigrade Testing or rapid Analysis by Graduated Vessels and Prepared Test Liquors.

GRIFFIN'S PATENT BLAST GAS FURNACE.

This Apparatus supplies, in the most commodious manner, a white heat, which can be used tor the Decomposition of every description of Ore or Mineral, or for the fusion of Refactory Metals in blocks of as much as 10lbs. weight. An Illustrated Description of this Furnace, post-free for 2d.

BLOWPIPE APPARATUS,

Including every requisite for the examination of Minerals and Metallic Substances, arranged in portable Cabinets.