Improvements in Means or Apparatus for Facilitating Calculations relating to Secondary Electrical Batteries.
Year: 1898

page_text: Date of Application, 23rd Nov., 1898
Complete Specification Leit, 5th Dec., 1893-Accepted, 11th Feb., 1899
Improvements in Means or Apparatus for Facilitating Calculations
relating to Secondary Electrical Batteries.
MORTON BLENCOWE COTTERELL, Electrical Engineer, Waverley, Gravelly Hill,
in the County of Warwick, do hereby declare the nature of this invention to be
as follows:-
In determining the most suitable size and electromotive force of the requisite
secondary battery for a given installation of electric light or power various cal-
culations have necessarily to be made. These for the most part have reference to
the size and number of cells most suited to the work, and to their cost. My
invention affords a ready means of effecting these calculations. If the number
of lamps or the total current of the installation be known and the voltage be
agreed upon, the most suitable size of cell and the cost of a cell or of an entire
battery of such cells are automatically indicated by the means according to my
invention. Or if one or more of the quantities concerned be not known or is or
are in debate my invention provides a ready means of inspecting and comparing
the results to be achieved or the outlay required by different combinations of the
various quantities concerned. My invention also provides a ready means of
comparing the results and costs of two or more different styles types or makes
of secondary batteries by providing for each atyle, type, or make, of secondary
battery, an indicating device according to my invention marked with lists and
scales, in accordance with the several styles, types or makes of secondary bat-
teries.
The device consists of two cards made to slide one upon or within the other.
I will presume for the purposes of description that the cards (which I will refer
to as the under and upper cards) are so connected that the one can be slidden over
the other. The upper card is of smaller size than the under card and is provided
with an opening. At the edge of the top of the upper card is a scale of the
voltages at which the lamps are to be run and on the said upper card at the edge
of the said opening is a list of voltages and numbers of cells in the batteries. On
the under card in proximity to the scale of voltages on the upper card is a scale
of the number of lamps (say 60 Watt lamps) in the proposed installation and on
the under card is a scale of the various sizes of plates in the batteries and the costs
of such batteries. In using the device the upper card is slidden along the under
card until the desired voltage of the voltage sale on the upper card is opposite the
required number of lamps on the scale of the number of lamps on the under card
and then the nearest size of battery which is suitable for the proposed installation
will be seen (on the scale of size plates and costs of batteries on the under card)
under an arrow on the upper card and opposite the pre-arranged voltage.
Dated this 17th day of Santember 1808
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: Improvements in Means or Apparatus for Facilitating Calculations
relating to Secondary Electrical Batteries.
I, MORTON BLENCOWE COTTERELL, Electrical Engineer, of Waverley, Gravelly
Hill, in the County of Warwick, do hereby declare the nature of my inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statemen::-
In determining the most suitable size and electromotive force of the requisite
secondary battery for a given installation of electric light, or power, various cal-
culations have necessarily to be made. These for the most part have reference to
the size, and number of cells, most suited to the work, and to their cost. My
invention affords a ready means of effecting these calculations. If the number
of lamps, or the total current of the installation be known, and the voltage be
agreed upon, the most suitable size of cell, and the cost of a cell, or of an entire
battery of such cells, are automatically indicated by the means according to my
invention. Or if one, or more, of the quantities concerned, be not known, or is, or
are, in debate, my invention provides a ready means of inspecting and comparing
the results to be achieved, or the outlay required by different combinations of the
various quantities concerned. My invention also provides a ready means of
comparing the results, and costs of two, or more, different styles, types, or makes,
of secondary batteries, by providing for each style, type, or make, of secondary
battery, an indicating device according to my invention marked with lists and
scales, in accordance with the several styles, types, or makes, of secondary bat-, :
teries. The accompanying drawings illustrate devices constructed in accordance"
with my invention. Figure 1 is a face view of the device and Figure 2 is an
elge view. Figure 3 shews the undercard with the upper card removed.
Figures and illustrate in face view and edge view a modified form of the
device. The under card is marked A. The upper card B is of smaller size than
the under card A and is provided with an opening B. At the edge of the top of
the card B is a scale 6 of the voltages at which the lamps are to be run and on
the said card B at the edge of the opening B2 is a list of voltages and numbers of
cells in the batteries. On the card A at a³ and in proximity to the scale 6³ is
a scale of the number of lamps (says 60 Watt lamps) in the proposed installation
and on the card A is a scale a³ of the various sizes of plates in the batteries and
the costs of such batteries. The card A has in it a slot a and through this are
passed pins, or the like 2, secured to the card B, and, at the back of the card A,
to a strip b. The card B can thus be slidden sideways on the card A.
The scales are marked out logarithmically, i.e. although the numbers on the
scales are natural numbers, the distances between the numbers on the same scale
are not in proportion to the value of the numbers, but of their logarithms. Thus
if a scale were marked out into 1000 equal divisions.

page_text: voltage
The cells are practically written in a scale of amperes according to their dis-
charges, and all that it is necessary to shew of the fourth scale is the "1" of the
equation, which of course occurs at the fixed index on the calculator card.
In using the device the card B is slidden along the card A until the desired
voltage of the scale 63 is opposite the required number of lamps on the scale a³,
and then the nearest size of battery which is suitable for the proposed installation
will be seen on the scale a³, under the arrow c, and opposite the prearranged
voltage.
When the arrow c indicates between two sizes of battery plates, on the scale a³,
the card B should be moved so that, first the smaller, and then the larger, size
of battery plates comes under the arrow c and in each case it is observed, on the
scale a³, how many lamps the agreed voltage will supply with the battery in-
dicated, or if the voltage be in question, the electro-motive force at which each
of the batteries indicated will do the most work is observed by the scale 63.
I do not limit myself to the precise way of connecting the cards as shewn in
Figures 1 and 2 of the accompanying drawings as the card B may for example be
made double, that is in two side picces connected at the top and bottom edges,
and open at the ends y as shewn in face view and cross section in Figures 4 and 5
the card above having the necessary openings to enable the scales and lists on
the card below to be seen. In Figure 4 the scales and lists which correspond
with those shown in Figure.. 1 and 3 are marked with the same letters of reference.
The cards have a double series of lists for two different types of batteries.
the arrangement Figures 4 and 5 each side of the cards may be utilized as herein-
before described, one side, for example, being marked with continuations of the
scales and lists of the other side.
In
Having now particularly described and ascertained the nature of this
invention, and in what manner the same is to be performed, I declare that what
I claim is
Means, or apparatus, constructed and arranged substantially as hereinbefore
described and illustrated in the accompanying drawings for use in making cal-
culations as to secondary electrical batteries.
Dated this 5th
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.