Improvements in and connected with Rule Gauges.
Year: 1890

page_text: Date of Application, 3rd Nov, 1890-Accepted, 11th Apr.,
1891
COMPLETE SPECIFICATION.
Improvements in and connected with Rule Gauges.
1, MENS ANDREAS DAHL, of West Orange, Essex County, and State of New
Jersey, Machinist, my post office address for ATTACHMENTS FOR GRADUATED
RULES being West Orange aforesaid, do hereby declare the nature of my
invention, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
The object of this invention is to simplify measurements as taken by a graduated
rule and enable the workman to keep continually the same exactness of measure.
The invention consists in the improved attachment for graduated rule and the
combination and arrangement of parts thereof substantially as hereinafter described
and finally embodied in the claims.
Referring to the accompanying drawings in which like letters of reference
indicate corresponding parts in each of the several figures.
Figure 1 is a plan view of my improved device attached to a graduated rule.
Figure 2 is an underside view of Figure 1.
Figure 3 is an enlarged section on Figure 1.
Figure 4 is an enlarged section on line y y Figure 1.
And Figure 5 is an enlarged section on line Fig. 1.
In said drawings A represents the graduated rule on which is arranged my
improved attachment. This attachment consists of an elongated grooved block a
adapted to slide on one side of the graduated rule A. The underside of the block
is recessed as shown in Fig. 2 to allow the adjustment and arrangement of a spring
rod. On the underside of the upper portion of the block a is secured in any
desired manner a flat spring b adapted to rest on the surface of the rule A. In the
top portion of the block a is a threaded opening in which works a threaded adjusting
screw c, the lower end of said screw resting on the spring b, so that by turning
down the screw the attachment will be firmly held on the rule as will be manifest.
In one end of the block a' is a dove-tail slot d in which is adjusted a sliding block e.
This block e is secured to one end of the spring rod f and is formed on one side
with a sharp knife edge or point g shown in Fig. 5. This knife edge rests on one
of the graduating marks on the rule A. and is held there by the action of the
springf In the front of the block a is a sharp pointed pin or projection with
a flat side and so arranged that this flat side shall be on a line exact with the end
of the block.
In operation, the screw is loosened thereby releasing the spring b: the block a
is then moved to the exact distance required between the side of the block and the
end of the rule. The sharp edge of the block e will then enter the gauge mark on
the rule and be held in place by the spring f. The screw will then be turned
down and bind the block a firmly to the rule A. In this manner the workman will
always have a uniform gauge and one that is not shifting and it will not be necessary
to examine it every time it is used to see that it is exact.
When two of the attachments are used they will be adjusted "right and left"
and in this manner can be used as a beam compass.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
In an attachment device for a graduated rule an engaging block having a knife
ם

page_text: edge or point adapted to engage.the graduating marks on the rule as described and
for the purposes set forth.
Dated the Third day of November 1890.
C. R. BONNE & Co.,
41, Eastcheap, E.C., Registered Patent Agents, acting for the Applicant.