Of South Kensington, and is described in his British Patent 24868 ofġ902 (also in US Patent 786839, filed in 1903). The mechanism was designed by Arthur Postans The trade mark embossed into the top cover The machine has a one-piece cast-iron casing with sheet-metal The clearing leverĪt the left-hand side returns the three dials to zero. An automatic tens-carry mechanismĪdvances the tens and hundreds dials as required. The setting keys are numbered from 1 to 10 and operate on the The three dialsĪre mounted side by side behind the window at the top of the machine. Three-digit register and a ten-key setting mechanism. The "Adder" is a single-column desktop adding machine with a Manufactured: London, England, early 1900s. "Adder" single-column adding machine, S/N 7145ĭimensions: body 90W x 120D x 115H, overall 120 x 180 x 115mm The principle lived on is several small machines which re-appeared Martin says that the Adix was "long discontinued" by 1920, but ![]() The large left-hand gear is then turned anti-clockwiseīy hand to clear the hundreds dial via a slipping clutch. When theġ key is released the two dials advance to 00, and the hundredsĪdvance by 1. The right-hand gear is then spunĬlockwise by hand until the first two dials stop at 99. To clear the register, the 1 key is held down to raise a stop into Simple odometer-style tens-carry mechanism. The gear then drives a 3-dial register with a Spring pulls the rack back to its home position, advancing the gearīy the required amount. Gear is held by a backstop pawl at the top. Via a diagonal rod to an arm which rests on the right-hand gear.Īs the key is pressed the arm rotates anti-clockwise, but the Graduated ramps, such that pressing a key will move the rack aĬorresponding distance to the right. Lined wooden case, which can easily be carried in a coat pocket.Ī sliding rack at the front of the machine carries a series of German clockmakers Pallweber & Bordt, and this horological heritageĬonstructed of steel and brass, with a brushed aluminium escutcheonĪround the numeral wheels. The Adix from 1903 is a single-column key-driven adding machine Manufactured: Adix Company, Germany, 1903. "Adix" single-column adding machine, S/N 4824 Progress in the construction, operation, and internal mechanisms of The machines on this page show something of the variety and the In Australia, as they were sold in quantity during the mid-1960s toĪssist in the change-over to decimal currency. Resulta) continued in production for almostĤ0 years. Novelties, while others (such as the far more capable Most of these small adding machines were fairly short-lived. Wondrous variety in the arrangement of the discs, dials, and tens-carry Reversible registers and some are fully bi-directional. Subtraction (when offered) is usuallyĭone by the addition of complements, although some machines have Most of the simple machines rotate only in one direction, and mostĪre limited to addition only. ![]() Rotated indirectly through various sorts of setting and actuating In more complex versions the register dials are Machines the discs are often rotated directly by finger pressure, or Horizontal axis to form a "register" or "accumulator". Plastic discs, numbered around their edges, and mounted on a single The most common design of small adders involves a series of metal or These "multi-axis" machines were quite popular during the 1920s and 30s. Rows of smaller 10-tooth dials mounted flat on a long ruler-like base. These machines were often based on a large flat disc withġ00 numbered teeth, with a simple carry mechanism into the hundredsĪs carry mechanisms improved, multi-column machines were built with There are many types of simple adding machines based on rotaryĭiscs and dials, and mainly intended for personal or light-dutyĮarly machines (from the 1850s to the early 1900s) were oftenĭesigned for adding only a single column at a time - first the unitsĬolumn, then the tens, and so on, in the same way that addition is done John Wolff's Web Museum - Small Rotary Adding Machines John Wolff's Web Museum Small Rotary Adding Machines
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