08 Advertisements. 



ELECTRO-METALLURGICAL APPARATUS. 



Electro-Type Apparatus, for procuring by Galvanic action perfect 

 fac-similes of Engraved Copper Plates, Wood Blocks, and also correct 

 Copies of Medals, Seals, Plaster Casts, and all kinds of Metallic 

 Ornament Single Cell Apparatus, Precipitating Troughs and Batteries, 

 Apparatus for Electro-gilding and Plating, Binding Screws, Porous 

 Jars, Plaster Casts, Wax Moulds, and every Material required in the 

 varied Processes. 



TOXICOLOGY. 



PALMER'S TOXICOLOGICAL CHESTS, 



Containing all the most approved Tests for the Detection of 

 Poisons, and a complete Set of Apparatus for performing the neces- 

 sary Experiments, with Directions. 



Price 3. 3*. and 2. 2*. 



MARSH'S Apparatus for the Detection of Arsenic. 

 MORTON'S Improvement of Ditto, as recommended by the Society of 



Arts. 

 CHRISTISON'S Apparatus for the Detection of Poisons. 



Pure Tests and Re-agents. Caustic Pencils and Points. 

 Urinometers in Cases, from 4s 6d to 1 15s. 



SURVEYING INSTRUMENTS. 



Common Theodolites, Ditto best Construction with Tangent Screw, 

 Telescope, &c. Troughton's Levels, Dumpy Levels, Y Levels, Por- 

 table Levelling Instruments, Common Spirit Levels, Spirit Levels 

 with best Ground Bubbles, Miner's Magnetic Compasses, Prismatic- 

 Compasses, Protracters, Perambulators, Station Staffs, Surveying 

 Crosses, Plain Tables, Measuring Chains, Plotting, Marquois, Gunter's 

 Scales, and other Rules. 



