409,101. Calculating - machines. FAIRWEATHER, W. C., 65, Chancery Lane, London.-(Underwood Elliott Fisher Co. ; 342, Madison Avenue, New York, U.S.A.) Jan. 31, 1933, No. 2958. [Class 106 (i).] In a typewriting and calculating machine comprising a carriage and a plurality of totalizers, some of the normal alphabet keys are adapted, in a certain position of the carriage, to select the totalizers into which the next item is to be entered and to print a letter to prove that the item is entered in the correct totalizers. Certain of these keys may at the same time set the machine to subtract the item from the chosen totalizers. The invention is shown applied to a machine of the Underwood- Hansen type having five totalizers. The depression of a numeral key 20 sets, through linkage 30, 35, a pin 31 in a bar 36. There is a denominational set of bars 36 for each totalizer 39 and the bars of the totalizers operative at any time are selected denomination by denomination by rods 45 operated through levers 42 by cams 41 on the typewriter carriage. The cams 41 are set on the carriage to bring the appropriate totalizers into operation at the various carriage positions. In a particular position, some or all of the totalizers are also under the control of " proof keys " 21. These keys are normal alphabet keys of the machine, but when depressed with the carriage in this particular position certain totalizers are selected and the typing of the ordinary key letter in a column 106 of the worksheet is proof of this correct selection. When a proof key 21 is depressed, those totalizers which are not required are disabled. The rods 45 are mounted at their upper ends in slides 50, Fig. 7, which are moved rearwardly beyond the reach of the levers 42 by springs (not shown) which pull down links 62 connected by cranks 55, shafts 56, cranks 57 and links 58 to cam rollers 59 engaging inclined slots 61 in the slides 50. The links 62 are released when bars 64 are drawn forwards, these bars being connected to bars 80 operated by the proof keys 21, the connection being effected by couplers 83 pivoted at 84 and having projections 88 engaging slots in the bars 80, 64, the projections being arranged so that the slides 64 are moved to disable the appropriate totalizers upon the depression of any proof key. The proof keys only assume their totalizer-controlling function when the carriage is in a particular position in which a cam 98 on the carriage elevates a link 102 to swing a latch 94 out of engagement with teeth on the links 62 to permit these links to operate. The totalizer-disabling mechanism is restored by a cam on the carriage as the latter completes its return movement. A bar 160, Fig. 2, moving with the operating bar 37 rocks a bell-crank 158 which moves to the right a link 162 pivoted to a lever 163 to rock arms 165, 166. The arms 166 are moved away from projections 168 on the members 40 carrying the cams 41 which latter are then moved away from the levers 42 during the operating cycle. Subtraction. The machine is normally set for subtraction by a carriage cam 135, Fig. 2, rocking a lever 137, Fig. 1, to raise a link 138 and withdraw a latch 140 from the end of a lever 141 which is then moved by a spring 145 to condition the machine for subtraction by complementary addition in a known manner. The lever 141 is restored by the operating bar 37 as this bar moves to the left during the operating cycle. The operation of certain of the proof keys 21 to select the totalizers may set the machine for subtraction, the links 62 for this purpose contacting with a lever 153 when they are depressed. The lever 153 is connected by a link 156 to the subtractionsetting lever 137. At the next machine operation the lever 153 is drawn behind the links 62 by an arm 173, Fig. 7, and restored to additive position by a spring. The arm 173 is operated from the lever 163. In a modification, Fig. 18, each proof-key bar 180 releases only one link 62, the couplers being dispensed with. Each link 62 is connected to several totalizer-disabling slides 50. In a further modification, the slides 50 are normally in the disabled position and are moved into active position by the cam rollers 59, the slots 61 being inclined in a direction opposite to that shown in Fig. 7.