518,864. Calculating-apparatus. BRITISH TABULATING MACHINE CO., Ltd. June 8, 1938, No. 17083. Convention date, June 9, 1937. [Class 106 (i)] Comprises an electric adding and multiplying mechanism which in the particular example described is adapted to make a cross addition of items punched on a card and to print and punch the sum or to multiply two factors punched on a card and to print or punch the product.. Card feed and sensing mechanism. The main shaft 10 is driven from a motor M and drives a shaft F to which a cam 22 is clutched when a solenoid 16 is energized to release a latch 17. The cam 22 through linkage 23, 24, 25 operates a pusher 26 to feed a card C from a magazine 27 to feed rollers 28 and in one revolution of the shaft F to advance the card to reading brushes 30 and in the next revolution to a field of punches 58. Printing and punching mechanism. A cam 62 is clutched to a shaft P driven from the shaft F when the latch 36 is released on energization of the magnet 35. A cam 39 on the shaft P through linkage 40, 53 actuates a bail 55 extending across vertical spring sliders 56. The notched sliders are locked in selected positions by pawls 60 released by magnets 61. A punch plate 65 is actuated from the cam 62 through linkage 63, 64 and operates punches 58 through the selectively-positioned interposers 57 on slider 56. A bar 43 operated through levers 40, 42 controls the position of type carriers 44 which are locked by latches 48 released by magnets 49. A bail 51 connected by links 50 to lever.42 near the end of the movement of the latter releases the printing hammers 52. Adding mechanism. The shaft AS is clutched to a gear drive from shaft P when a latch 85 is released on magnet 76 being energized. Through cams and links 75, 74 an arm 72 with pin and 'slot connection to bar 71 is moved to the left, Fig. 2. The adding slides 69 follow under the influence of their springs 70. Each slide has notches 68 numbered 0 to 9 which pass a pawl 67 as the corresponding numbered holes on the record card pass under brushes 30. The pawl 67 is released to engage a notch when the magnet 66 is energized. Carried by each slide is a group of contacts 89 which move over contact segments 90. If the record card sensed has a perforation in the " 0 position, the pawl 67 is tripped to engage the " 0 " notch 68 and the right-hand contact 89 will be over the segment 90 marked " 0 " and so on. The slide 91 is held in the position shown in Fig. 2 by a pawl 93 against the tension of a spring 94. When the magnet 95 is energized the pawl 93 is released and the spring moves the member 91 to the right a distance equal to the space between two contacts serving to perform a " carry " of a unit to the next higher denomination by making contacts 95a. The slide 91 is restored when slide 69 moves to right by a pin and lever 98, 97. The machine is also provided with slide 69a, Fig. 2a, having each three contacts 89a and a contact 89b co-operating with segments 90a on a member 91a. Factor slides. When the machine is used for multiplying a cam 104 is clutched to a shaft FS driven from shaft AS when the magnet 106 is energized and an arm 109 moves a bar 110, Fig. 1, to the left. Spring moved slides 111 follow the bar 110. Carried by slides ill for the multiplying factor are eight contacts 117 MP four on each side, while slides 111 associated with the multiplicand factor carry four contacts 117 MC two on each side. Each of the contacts 117 MC, 117 MP traverses a row of' contact segments 118 and is positioned according to the digit entered. Circuit diagram. The operation by which three amounts punched on a record card are cross added and the sum punched will now be described. The brushes 30 for fields C 1 , C 2 , C, are wired to plug sockets 124 and the punch selecting magnets 61 to sockets 125. The sockets 124 are connected to plug sockets 127 those sockets associated with the units digits of the three amounts being connected to three adjacent slide controlling magnets 66, those associated with the tens to the next three magnets 66 and so on. Each set of three magnets constitutes a section which includes two slides 69 and a slide 69a. The sockets 125 are connected to sockets 129 for print control magnet 49. From sockets 129 connections 130 extend to sockets 131 so that print and punch magnets 49, 61 for the " units " are connected to socket 131 for "units" of the adding mechanism. Similarly for tens &c. A group of sockets 200 is connected to contacts AS3 and from there connections 201' are made to sockets 127 of magnets 66 not connected to brushes 30. The contacts AS3 are timed to complete circuits to stop the connected slides in the " 0 " position. The " add " key is pressed to open contacts 132 and de-energize relay T and " start key to close contact 12 to complete the circuit through the motor M, relay R and card feed magnet 16. The shaft 10 rotates and feed starts. During this cycle, the F cams operate towards the end of the cycle to energize print magnet 35. The shaft P is now coupled and makes a cycle which is idle since no card is present. The first card has " 0 " ready to pass the brushes near the middle of the revolution of shaft P, and the magnet 76 is energized and shaft AS makes a complete revolution to restore the slides in the first half of the revolution. Near the end of the " print" cycle cam contacts P1 close and magnet 16 is energized, shaft F rotating to cause advance of a card to the brushes 30. During this cycle, the adding slides 69, 69a are moved in synchronism and are differentially positioned under control of the perforations in the card and are next advanced to punching position when circuits through magnets 66 are completed at different times according- to the location of the punch holes. The three contact plungers 89a are connected through lead 137 to line 14, and contact plunger 89b through main lead 138 to line 14. The segments 90a are connected through flexible leads 139 to contact plungers 89 of the next slide 69 as shown. The segments 90 of the intermediate slide are connected through leads 140 to plungers 89 of the lowermost slides 69. Finally segments 90 of the last slide are connected to a group of result leads 141 which through contacts Dl of relay D may be connected to lines 142 extending to contacts 119 of emitter El. Transfer. A relay A is energized whenever the sum of the digits entered in the next lower section reaches " 10 " or more and makes circuit of a carrying magnet 95. Total Printing and Punching. Near the end of the feed cycle, the relay B is energized in parallel with which are relays D. As brush 120 rotates with shaft P and wipes over contacts 119 in synchronism with movement of type elements 45 and punch interposers 57. Circuits are completed through sockets 129, 125 to print and punch magnets 49, 61 for " units," " tens " &c. of totals. During rotation of the slides the hammers are tripped and punches forced through the card. Multiplying mechanism. The machine shown is adapted to add the partial products of a twodigit multiplier and multiplicand and punch the product. For multiplying, the plug connections 126 are removed from sockets 127 and plug connections 145 made. The other ends of connections 145 are extended to plug sockets 146 from which flexible wires 147 extend to contact slide plungers 117MC. Adjacent sockets 146 are indications U, T, H, TH and connections from these sockets are made to the units, tens and sections of the adding mechanism. Further plug connections 148, 149 are made to sockets 124 whose brushes traverse the multiplier and multiplicand fields of the card. Unused positions are connected to sockets 200. To' start, the multiplying key 150 is pressed to energize relay T and switch 88a opened. A key 203 is depressed to energize magnet 76. Key 11 starts the motor M for adding and the magnet 16 causes the card feed to operate. Near the end of the feed cycle the slides 69, 69a move and receive entries. Before the shaft AS comes to rest magnet 35 is energized and shaft P makes a cycle to position type and punches, the factor slide magnet 106 is energized and also magnet 76. Both sets of slides are restored during the second half of the cycle. As the adding slides 69, 69a move to take positions 0, 1, 2 &c. the brushes 121 rotate and wipe segments 122 in the same order. At the end of the feed cycle, the first card is in punching position and the factors are set up on slides 111MP, 111MC. During the following cycle, the partial products-of the two factors entered will be automatically determined and entered upon the adding slides as the latter move in setting-up direction. At the end of the feed-cycle, the shaft AS is clutched in to make a half revolution. During this brushes 121 also make a half revolution and during their movements circuits will be completed to enter all partial products through circuits shown in Fig. 6b where each of the ten commutators 121-123a on the right is assigned to a different multiplication table from nought-times to nine-times table, the segments of the commutators being connected to the segments 118 of the multiplier slide in accordance with the multiplication table. This arrangement is duplicated on the left of Fig. 6b for the tens multiplier slide. Specification 307,025, [Class 106 (i)], is referred to.