
https://archive.org/stream/scientific-american-1897-11-06/scientific-american-v77-n19-1897-11-06_djvu.txt

Full text of "Scientific American Volume 77 Number 19 (November 1897)"

F. B. H. writes: I am an old reader of your valuable paper, and I want to ask a few 
questions in regard to the eight light dynamo described 
in Supplement, vol. xxiv. No. 600. My question is 
this: Can I double the drawings in every respect and 
get an operative machine? I mean one, if well constructed,
that would answer as well as the eight light 
machine. If any changes are needful, please state what 
they are. Be sure to state size of wire for armature and 
field magnets, the winding being the same as in the 
eight light machine. Should I double the length and 
diameter of armature? To be short, if I were to double 
or multiply by 2 all the measurements given, would my 
machine be out of proportion? 

A. The sizes given in the drawings of the eight light dynamo can be doubled. 
This makes the machine 4 times as large.
If it is wound with the same sizes and number of turns of wire as the original, 
it will have the same current in amperes, but 4 times the voltage. 
If the field is made larger, the armature should be increased in the same degree.
Now, if you also use wires twice as thick, but have the same number of turns, 
the carrying capacity in amperes will be increased 4 times,and the total output of the machine will be 16 times as great.
In place of No. 20 wires use No. 14 on armature. In place of No. 18 wire use No. 12 on field. 

240V 40A DC

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https://archive.org/stream/scientific-american-1889-12-28/scientific-american-v61-n26-1889-12-28_djvu.txt

Full text of "Scientific American Volume 61 Number 26 (December 1889)"

(1649) L. C. asks : 
1. Have ydli ever described a motor of one or two horse power? If so, in what number? 
A. No. 
2. Could the eight light dynamo described in No. 600, Scientific American Sup- 
plement, be used as a motor? 
A. Yes. 
3. If so, should any changes be made? 
A. No. 
4. About what power would the eight light dynamo develop used as a motor? 
A. About 1 horse power. 
5. What power would the eight light dynamo develop used as a motor increased to twice the size of the one
described in No. 600? 
A. If twice the size linear, it wonld be about 5 horse power. 

6. What power would this motor develop 
if the field magnets only are increased to twice the size? 
A. This would give an undesirable proportion, with no 
advantages. 

