US2203194A - Calculator - Google Patents

Description

Patented June 4, 1940 UNITED STATES PATENT OFFICE CALCULATOR Robert T. Frazier, Chattanooga, Tenn, assignor to Cavalier Corporation, Chattanooga, Tenn, a corporation of Tennessee Application November 6, 1939, Serial No. 303,112

2 Claims. (Cl. 235-84) This invention is a novel improvement in calof the e posed peripheral p n of disk culators, and the principal object thereof is to Scale A denotes monetary values. provide a simple calculator for determining the The upper or smallest disk B has a central average cost at any given locality of operating field B which may be used for advertising pur- 5 ranges, refrigerators, water heaters, and the like, Doses, r or receiving printed s uct ons for by electricity; also for determining the average using the Calculator, for Other imp d cost of operating such appliances by gas, whether adjacent e p p y of disk 3 is displayed the natural gas, manufactured or b ttl d gas; word Electricity. In the peripheral portion of also for comparing the cost of electric and gas sk B is an index mark 32 for the P p er operation of such a liances irrespective of f er de d, said p r ph l p n als 19 whether manufactured, natural, or bottled gas bearing an arrow B3 m r ed R n e, an arrow is used at u h locality, Bt'marked Water heater, and an arrow B5 It frequently happens that salesmen for' gas marked Refrigerator, the arrows B3, B5 and and/or electric ranges, refrigerators, water heat- B5 pointing to t scale A On the intermediate ers, and other appliances, are asked whether gas sk The Spacing 0n the inner d sk B, of or electric operation of such appliances is cheaper e r ws B5 s ed on e a e a e in a given locality. If the salesman is handling p wer n p n n ki w t hours of each of both types of apparatus he would naturally be e ee app iances listeddesirous of installing the more economic type of To determine t e e 00st o p on of 0 apparatus, but very few 521185111911 k h t such electric appliances, it is merely necessary make the necessary cost calculations for comto re a e t e smaller or inner disk B on the parative purposes and th h do k h intermediate or money disk A to such position find that such calculations are difficult and timeha h ndex l ne B i s pp i the r e p r consuming. Use of my novel calculator however, kilowatt hour on scale A for electricity at the when properly set according to the actual gas particular locality in question, and the average 25 and electric rates at such locality, will show at t of Operation of an electric range, electric a glance th relative costs based upon th water heater, or electric refrigerator, based on tional averages of electric current and gas conthe nat av age 0f Current Consumed, y sumed for such ranges, refrigerators, water heaten be read d y on scale pp the 33 tars, or th appliances, arrows B3, B5 and B5, respectively.

I will explain the invention with reference to On e peripheral p n 0 t e disk C is the accompanying drawing which illustrates one n index ine C 3 oopera t the legepractical embodiment thereof to enable others to rithmie Scale A on the intermediate disk A. The adopt and use the same; and will summarize in periphery of the lower or large t disk C is p 35 the claims, the novel features of construction, erably divided into three seg e t e s n 35 and novel combinations of parts, for which proe g e notation Natural another tection is desired. segment C2 bearing the notation Manufactured In said drawing: gasf; and a third segment C3 bearing the nota- Fig. 1 is a top plan view of the calculator. tion Bottled gas. In the segment C are ar- 40 Fig. 2 is a transverse section therethrough on rows C4, C5 and C6, respectively marked Range, 40

the line 2-2, Fig. 1. Refrigerator, and Water heater, each ar- As shown in the drawing, my novel calculator row pointing towards the scale A on the interpreferably comprises three superimposed disks mediate or money disk A. Similarly, in the e A, B, C, preferably of Celluloid or other suitable ment C2 are three arrows C1, C8 and C9, respec- 43 relatively stiff material, the intermediate disk beively m rk Ran e, Refri 0r," nd W r 45 ing of larger diameter than the upper disk, and ter heater, each arrow pointing to the scale A the lower disk being of larger diameter than the on the intermediate disk A; and similarly in the intermediate disk. The three disks are mounted segment C3 are three arrows Ciil, Ci l, and CIZ, for relative rotation by means of an axially disrespectively marked Range, Refrigerator, and

1) posed pivot pin, rivet, or other means P, trans- Water heater, each arrow also pointing to fixing the said disks. the scale A.

The exposed portion of the intermediate disk A The spacings of the arrows C4 to C12, respecbears a logarithmic scale A, including conventively, on the gas disk C are based upon the ient subdivisions similarly to the ordinary slideaverage monthly consumption in hundreds of rule, said scale preferably extending the full width cubic feet of manufactured and natural gas.

For bottle gas, either propane or butane, sold at rates in cents per pound or per one-hundred pounds, the spacing is based on average fuel consumption in pounds per month of each of the Manu- We ani asis g t. u. propane many Cu. fl. Cu. It. Liquid lbs. K WH Ban 9 1500 690 36.5 125 Reir gerator 2000 920 4B. 7 Water heater 2500 1160 60. 8 250 To determine the average cost of operation of a gas range in a city where natural gas is used, the intermediate disk A is rotated on the disk C until the rate per thousand cubic feet for natural gas, which applies to that particular 10- cality, coincides with the index line CI3, and the average cost of operation of a range is read directly beneath the arrow 04 marked Range in the natural gas segment C. If the average cost of operating a gas refrigerator is desired, the average cost may simultaneously be read directly opposite the arrow C5 marked Refrigerator in the natural gas segment C. The average cost of operation of the water heater using natural gas may also be read directly opposite the arrow C6 marked Water heater. Similarly, the average costs of operating on manufactured and bottle gas may be readily ascertained, using the related arrows in the segments C2 and C3 as the case may be, after setting the index line C|3 with respect to scale A in accordance with the rates is then rotated upon disk A until the index line W thereon points to the rate per kilowatt hour for electricity at that same locality. The cost of electrical operation 01 the range, the refrigerator, and the water heater may be read directly opposite thearrows B3, B4 and BI marked Range/P Refrigerator, or "Water heater."

I do not limit my invention to the exact form shown in the drawing for obviously changes may be made therein within the scope of the claims.

I claim:

l. A calculator for determining and comparing average costs of operation or electric and gas appliances, comprising three relatively rotatable coaxial members; the intermediate member carrying at its periphery a circular logarithmic scale extending entirely across the exposed peripheral portion thereof; one end member having an index line and at least one marking on its periphery cooperating with said scale, said marking being disposed with respect to the index line to accord with the national average consumption of electric current for a given period for an electric appliance; and the other end member having an index line and at least one marking on its periphery cooperating with said scale, said marking being disposed with respect to the index line 01' the last mentioned member to accord with the national average gas consumption for a like period for a gas appliance used for the same purpose as the electric appliance.

2. A calculator for determining and comparing average costs of operation oi! electric and gas appliances, comprising three superimposed relatively rotatable coaxial disks of progressively increasing diameters; the intermediate disk carrying a circular logarithmic scale extending entirely across its exposed peripheral portion; one end disk having an index line and at least one marking adjacent its periphery cooperating with said scale, said marking being disposed with respect to the index line to accord with the national average consumption of electric current for a given period for an electric appliance; and the other end disk having an index line and at least one marking adjacent its periphery co0pcrating with said scale, said marking being disposed with respect to the index line of the last mentioned disk to accord with the national average gas consumption for a like period for a. gas appliance used for the same purpose as the electric appliance.

ROBERT T. FRAZIER.

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