Improvements in and relating to Letter Copying Books.
Year: 1898

page_text: Improvements in and relating to Letter Copying Books.
I, SAMUEL HENRY CROCKER, of 31, Furnival Street, Holborn, Engineer, do
hereby declare the nature of this invention to be as follows:-
My invention relates to the class of copying books in which copies of letters
are taken by pressure and consists in providing these books with clasps, bindings,
or any other fastening device which shall retain these books closed, when a pneu-
matic force from the inside shall tend to open the same. These clasps or other bind-
ing appliances are intended only to act to prevent the opening of the copying book,
while a pneumatic distending action is in operation within the said book giving
the required pressure to copy letters on the ordinary moistened sheet of a copy-
ing book. When this pneumatic pressure is withdrawn, the clasps or bindings
can be loosened or released and the book opened in the usual manner. These
clasps may be either permanently attached to the copying books or removeable
therefrom, to attach to another copying book.
GEO. H. RAYNER,
7, Chancery Lane, London, Agent for the Applicant.
I, SAMUEL HENRY CROCKER, of 31, Furnival Street, Holborn, Engineer, do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the follow-
ing statement:
My invention relates to a letter copying book in which the pressure for making
the copies is provided by a pneumatic distending force within the covers of the
book. My improved letter book is strongly bound and provided with covers
sufficiently strong to resist the pneumatic pressure exerted from the inside.
These books are provided with clasps or other suitable fastenings strong enough
to retain the covers of the book in closed position while the pneumatic pressure
is acting to copy the letters.
The pressure exerted through the pneumatic distending action is transmitted
in a well known manner by using an air tight bag; this bag is placed within
the book and is of sufficient size to cover the letter to be copied. This bag is
provided with an inlet tube through which the air is forced, to give the necessary
pneumatic distending action. The air is forced into the bag to give the required

page_text: pressure by any ordinary air pump which is removably attached to the inlet
tube.
In order to carry out my invention, I place within the covers of the book the
air bag before referred to with the air pump attached. I now sufficiently moisten
one of the thin sheets of my letter book, and place the letter to be copied against
the same in the well known manner. The book is now closed and the clasps
secured, and air is pumped into the bag and the letters are copied by the pneu-
matic force exerted. The pump is now removed and the air pressure released when
the clasps can be unfastened and the book opened, when a good copy of the letter
will be found to have been made owing to the even pressure given by the pneu-
matic distending action.
In order that the invention may be more clearly understood, reference is had
to the accompanying sheet of drawings in which
Fig. 1 shows my improved letter book strongly bound and with stout outer
covers provided with clasps A.
Fig. 2 shows an end view of my improved book with the bag (marked B) trans-
mitting the pneumatic force within the covers, and,
Fig. 3 shows the bag provided with the tube through which the air passes to
and from the bag and an ordinary bellows valve (marked C) which is the type of
air pump which I find suitable to my invention.
The air bag referred to can be made of any air tight material and the device
for pumping in the air may be of any well known kind, such as an indiarubber ball
of the type used for spray diffusers.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
-
A letter copying book provided with clasps or equivalent devices to maintain
the book in a closed position against a pneumatic distending force arranged to
act within the book for the purpose of copying letters.
Dated this 14th day of September 1899
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.