When HewlettPackard introduced the HP35 scientific pocket calculator in January, 1972, it marked the first major advance in personal computing instruments since the slide rule was invented a century ago. Today, the HP35 has become an indispensable aid to thousands of engineers and scientists throughout the world.
Like a slide rule, the HP35 gives you answers where they're needed: at your desk, in a meeting, at home, in a plane, in a hotel room, at a remote project siteanywhere in the world.
But beyond this portable convenience is the extraordinary computational power the HP35 puts at your fingertips. It performs logarithmic, trigonometric and other mathematical functions with single keystrokes and eliminates the need to refer to log or trig tables. It displays up to 10 significant digits and automatically positions the decimal point throughout its 200decade calculating range (10^{99} to 10^{99}).
An important feature of the HP35 is the fourregister operational memory stack which lets you automatically store and retrieve intermediate answers while performing complex calculations. Stack control keys permit rolldown of any entry to the display for review or further processing. The operational stack, coupled with reverse Polish notation, provide the most efficient means known to computer science for evaluating mathematical expressions. Thus, there is seldom a need for scratch notes or the reentry of intermediate solutions.
In addition, the HP35 provides a separate, addressable memory register for selective storage and retrieval of constants or other data.
For greater speed and versatility, the following specific functions are preprogrammed into the HP35:
Using the HP35's preprogrammed capabilities, you can solve these and other functions, such as squares, nth roots, and common antilogarithms, 10 times faster than with a slide rule. Press a few keys and see your answer displayed with an accuracy of up to 10 significant digitsa level of precision which exceeds that to which most physical constants of the universe are known.
With the HP35, you can enter data in either fixed or scientific notation. Answers larger than 10^{2} and smaller than 10^{10} are displayed in fixed notation with the decimal point properly positioned. For values outside this range, answers are displayed in scientific notation, with the exponent of 10 (plus or minus) shown at the right of the display. In either case, insignificant trailing zeros are automatically blanked for easier reading. Negative numbers or exponents can be entered by pressing the CHS (changesign) key after the last digit. Exponents are entered by pressing the EEX (enterexponent) key.
Overflow and underflow are indicated by the HP35's closest answers, 9.999999999 x 10^{99} and zero respectively. Improper operations, such as taking the square root of a negative number, are indicated by a flashing display.
The HP35 features a bright, easytoread lightemitting diode display specially developed for this application by HewlettPackard's own optoelectronic design group. Since the displays are made from semiconductor materials, theylike the largescale integrated circuits used inside the HP35do not wear out with time.
The unique HP35 keyboard has been carefully laid out for convenient fingertip operation. Because the keys are small and widely separated, there is less chance of misentering data by striking two keys simultaneously. Moreover, each key has a "breakaway" or "overcenter" touch similar to the key action for a highquality electric typewriter to give a positive indication that contact has been made.
Finally, the compact, contoured HP35 case represents a breakthrough in modern packaging techniques. Small enough to fit in a shirt pocket, rugged enough to withstand substantial punishment in field use, the case gives the HP35 a comfortable "feel" and makes the calculator even more convenient to use.
Easytoread LED display gives answers with accuracy of up to 10 significant digits. Decimal point is automatically positioned. Numbers smaller than 10^{2} and larger than 10^{10} are displayed in scientific notation, with the exponent of 10 (phis or minus) shown at the extreme right.
Preprogrammed functions let you perform log, trig and exponential calculations 10 times faster than with a slide rule. Operates on battery or ACline power. The HP35 comes with a rechargeable nickelcadmium battery pack which provides enough power for three to five hours of continuous operation. Impending battery depletion is indicated by the lighting of all decimal points in the display. ACline operation (115 or 230 volts) and simultaneous battery charging are accomplished by simply plugging in the battery charger supplied with the HP35. 
Compact, rugged case fits easily into shirt pocket or briefcase.
Fourregister, operational memorystack automatically Stores and retrieves intermediate solutions during complex calculations, eliminates need for scratch notes and reentry of data. Data manipulation keys allow contents of any register to be displayed for review. A separate, addressable memory register is also provided for storage and retrieval of constants. Try it for 15 days 
Functions:

Power
AC: 115 or 230 V +/ 10%; 50 to 60 Hz; 5 watts.
Battery: 500 mW derived from nickelcadmium rechargeable battery pack.
Weight
Calculator: 9 ounces (255 grams) Recharger: 5 ounces (142 grams) Shipping Weight: approx. 2 lbs (900 grams)
Dimensions
Length: 5.8 inches (14.7 cm) Width: 3.2 inches (8.1 cm) Height: 0.7 to 1.3 inches (1.8 to 3.3 cm)
Temperature Operating Range
32°F to 122°F (0° to 50°C)
Accessories Included
Optional Accessories (Details sent with HP35)
Warranty
HewlettPackard pocket calculator products are warranted against defects in materials and workmanship. This warranty applies for one (1) year from the date of delivery. We will repair or replace components which prove to be defective during the warranty period, provided that the defective units are returned to HewlettPackard. No other warranty is expressed or implied. We are not liable for consequential damage.
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