Calculating-Yardstick Page: 4 of 7
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Another L shaped plate 7 is detachably se- against the surfaces of the. grooves with
cured to the front and top edges of the head sufficient pressure to prevent the spools and
block 4 and to the front and top faces of the chart from rotating too freely and to keep
casing 3, the top portion of this plate being the chart taut on the spools.
5 extended in the direction of the top plate 5 A gear 33 is secured to the trunnion 20 70
and having its longitudinal edge depressed and another similar gear 34 is secured to
or crimped as shown at 9 so as to cooperate the trunnion 21. These gears do not mesh
with the depressed portion 6 to form a seat but are disposed at opposite sides of a shift-
for a strip of celluloid, mica, or other trans- ing gear 35 carried by a rocking plate 36.
10 parent material such as indicated at 10, this This plate 36 is pivotally supported upon a 75
strip being designed to close the slot 11 bracket 37 carried by the casing 3, the shaft
formed between the adjoining edges of the 38 on which the plate 36 is mounted, being
depressed portions 6 and 9. A longitudinal provided ,with a gear 39 which constantly
flange 12 is formed along the bottom of the meshes with the gear 35. Stop ears 40 ex-
15 plate 7 and extends under and is secured to. tend .laterally from the plate 36 and stop 80
the bottom portion of the plate 1. It will pins 41 are arranged in the path thereof,
thus be seen that when the plates 1, 5, and 7 these pins being extended from the casing 3.
are assembled with the head block 4 and A beveled gear 42 is secured to the shaft 38
the casing 3, an elongated casing having a and is located within the casing 3, this gear
20 longitudinal slot 11 in the top thereof is meshing with a smaller gear 43 which is 85
formed. . keyed or otherwise secured to an actuating
A supporting strip 13 is located directly shaft 44. Said- shaft extends transversely
under and close to the slot 11, the upper face of the casing 3 and beyond the front face
of this strip being transversely convex and thereof, there being a hand wheel 45 or any
25 the said strip being supported at its ends other suitable means whereby the shaft can 90
upon lugs 14 projecting from the head block be readily manipulated.
4 and the casing 3. The strip may be up- A hollow dial 46 is mounted for rotation
held at intermediate points by posts 15 ex- within the casing 3, and has a coiled spring
tending upwardly from the bottom of the 47 housed therein, the said spring being so
30 plate 1. connected -and mounted as to hold the dial. 95
Parallel spools 16 and 17 are located normally in a predetermined position, there
within the casing formed by plates 1 and 7 being a projecting ear 48 upon the dial
and at opposite sides of and slightly below which normally contacts with a stop pin 49
the supporting strips 13, the trunnions 18 extending from the casing 3. Numerals or
35 and 19 of the said spools being journaled other indicating data may be arranged in 100
within the head block 4 while the trunnions proper succession upon the periphery of the
20 and 21 thereof are journaled within the dial, said characters being designed to ap-
casing 3. Each of the trunnions 18 and 19 has pear successively within an opening 50
a disk 22. secured to it and provided, upon formed in the top of the casing 3. Ratchet
40 its periphery, with a spiral rib or thread 23 teeth 51 are form ed on one face of the dial 105
terminating at each end in an abrupt shoul- and are adapted to be successively engaged
der 24. Each of the threads engages the by a spring pressed pawl 52 which is piv-
teeth of a gear 25 journaled upon a bracket otally monted within an opening 53, formed
26 which is secured to the head. block 4, one in the top of the casing 3. .This pawl serves
45 of the teeth of each gear being of greater to hold the dial against rotrn movement, 110
width than the remaining teeth, as shown at after it has been rotated a pre-determined
27, so that when the gear 25 has completed distance against the stress of the.spring 47
- one revolution, the shoulder 24 will come therein. A guide casing 54 extends down-
into contact with the broad tooth:27 and wardly info the casing from an opening 55
50 thus prevent the thread 23, disl 02, and the in thu tnp thereof and has a button 56 slid- 115
spool to which it is connected. trom rotating ably rnijntecf therein and normally sup-
.any further in that directio. it will.be portid by a spring 57 located in the bottom
seen that by properly proporti inngthe gear portion of the casing 54. A dog 58 is piv-
25 and the thread 23, any predetermined otally mounted within the bottom and pro-
55 number of revolutions of the spool can- be jects through a slot in the casing 54, said dog 120
had before the spool is bright to a stop in being spring-pressed as indicated at 0 and
the manner described . normally engaging one of the teeth of the
Each. of the trunnions 20 and 21 is pro- ratchet 51. It will be apparent therefore
vided. with a disk 28 in which is formed an that when thebutton 56 is depressed, the dog
GC annular groove 29. The bowed end portion 58 carried thereby will partly rotate the dial 125
30 of a spring 31 is normally seated within 46 and thus cause another character to ap-
each of these grooves, tli lower ends of the pear within the opening 50. After the dial
springs being secured to lugs 32 extending has been rotated in this manner, it can be re-
from the casing 3. It will be apparent turned to its. normal position by pressing
65 therefore that these springs constantly'bear downwardly on the pawl 52 so as to release 13
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Weierhauser, Henry J. Calculating-Yardstick, patent, March 14, 1911; [Washington D.C.]. (texashistory.unt.edu/ark:/67531/metapth514790/m1/4/: accessed September 23, 2018), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting UNT Libraries Government Documents Department.