MAWSON & SWAN, 



EDUCATIONAL SETS OF APPARATUS, 

 FOR STUDENTS, &c. 



These Sets are made up of First-class Instruments. 

 Cheaper can be supplied, but are not here quoted. 



FRICTIONAL ELECTRICITY. 



No. i. Electrical Machine with cylinder 6 in. long and 4 in. diam., 

 mounted on mahogany stand, Leyden jar, brass discharger, glass 

 tube, coloured glass hand spiral, brass chain and box of amalgam, 

 in neat black box, i 125. 6d. 



No. 2. Same Apparatus as No. i, but with larger machine and Ley- 

 den jar, and in addition six pith balls and pith ball stand, 2 53. 



No. 3. Electrical Machine of superior construction, with cylinder 

 7 in. by 5 in., on mahogany frame, with brass conductors, 

 i Leyden jar 7 in. by 4 in., i do. 5jin. by 2f in., brass jointed 

 discharger, with glass handle, glass cylinder, coloured glass hand 

 spiral, image plate and pith dancing figures, 12 pith balls, head 

 of hair, electric whirl, brass chain, and box of amalgam, in neat 

 black box, $ 33. 



PLATE MACHINE SETS. 



No. i. i2-in. Plate Machine, Leyden jar, head of hair, whirl on 

 mahogany.stand, coloured hand spiral, jointed discharger, quad- 

 rant electrometer, brass chain, amalgam, &c., in neat black 

 box, ^4 173. 6 d. 



No. 2. i2-in. Plate Machine, large Leyden jar, head of hair, whirl, 

 coloured glass hand spiral, jointed discharger, quadrant electro- 

 meter, diamond coated jar, brass image plates and pith dancing 

 figures, set of 3 bells, insulating stool, gunpowder vase, pith balls, 

 brass chain, amalgam, &c., in black box, 6 155. 



Xo. 3. i5-in. Plate Machine, jointed dischargers, set of 3 bells, 

 whirl on mahogany stand, head of hair, 2 large Leyden jars, 

 diiimond^coated jar, coloured glass hand spiral, set of 5 spirals 

 on mahogany stand, coloured tubes and revolving balls, brass 

 image plate and pith figures, aurora or luminous flask, apparatus 

 for showing the falling star, syringe for exhausting these vessels, 

 insulating stool, gold leaf electrometer, thunder house, pith ball 

 stand, brass chain, pith balls, amalgam, c., in neat black box, 

 complete, 



and 15, Mosley-strect\ Neivcastle-on-Tyne. 



