SCIENCE 



FRIDAY, JANUARY ii, iS 



THE CONTINENTAL DYNAMO. 

 Many of the most important improvements that have been 

 made in the last few years in dynamo-construction have been 

 in the direction of greater simplicity and solidity of design, me- 



casing are one casting, so that there are no joints in the magnetic 

 circuit. The magnetic coils are wound separately, and are slipped 

 over the pole-pieces. The great advantages of this type of ma- 

 chine lie in low resistance of the magnetic circuit, and in the fact 

 that practically all of the lines of force pass through the armature, 

 together with its compactness and stability. The magnet coils 

 and armature are protected from injury by the outer casing ; and 



CONTINENTAL DYNAMO. 



chanically and electrically, and in the better proportioning of the 

 different parts. No radical changes or discoveries have been 

 made ; but, if we compare the dynamo of to-day with that of four 

 •or five years ago, we will find a greater efficiency, a much greater 



if it becomes necessary, they may be removed by simply taking 

 off one bearing. There being very little leakage of lines of force, 

 — only a few per cent compared with twenty to forty per cent for an 

 ordinary dynamo, — there is no ill effect on watches brought in its 



INTERIOR OF CONTINENTAL DYNAMO. 



output of current for the same weight of metal in the machine, 

 and less expense for repair. But while no radical changes in prin- 

 ciple have been made, yet some new types of dynamo have been 

 introduced that present important peculiarities. The Continental 

 dynamo, which we illustrate in this issue, seems to be as simple and 

 compact as it is possible to make a dynamo. The pole-pieces and 



neighborhood. The advantages of the dynamo seem to be in sim- 

 plicity and solidity of construction, accessibility of different parts, 

 no leakage of lines of force, and efficiency, while little care is neces- 

 sary in attendance ; and, as it is not high-priced, it is a machine 

 that in general is likely to meet the demands of a wide circle of 

 users. 



