This Hewlett-Packard advertisement, originally published in Scientific American, is used by permission. If errors crept in during the scanning process, please contact Dave Hicks

The new HP-27 Scientific/Plus is the most powerful preprogrammed pocket calculator Hewlett-Packard has ever built.

Its highly sophisticated design effectively integrates every significant scientific and financial function--and thus eliminates the need for two separate calculators.

The extraordinary versatility of the HP-27 will be extremely valuable to any scientist or engineer whose responsibilities extend into targeting, budgets, cost analysis and other financial and forecasting considerations.

The HP-27 gives you all the most-used statistical and financial functions, including five new functions never before made available on an HP pocket calculator--variance, correlation coefficient, normal distribution, net present value and internal rate of return for uneven cash flows.

With the remarkable HP-27, you can handle not only scientific calculations but other vital calculations you need to arrive at intelligent financial decisions and recommendations.

All the fundamental scientific, statistical and financial functions are preprogrammed and permanently stored in the HP-27. All you have to do is key in your data, press the appropriate function keys and see your answer displayed in seconds.

And for added convenience, the HP-27 provides an exceptionally large memory capacity, flexible display controls and selective clearing options.

The enormous variety of preprogrammed functions on the new HP-27--more than Hewlett-Packard has ever made available in one pocket calculator-gives you solutions to virtually every calculation required in science and business management.

The HP-27 gives you all the most-used exponential, log and trig functions-including sines, cosines, tangents and their inverses in three angular modes; natural and common logs and anti-logs; pi; related arithmetic functions; coordinate conversions; angle conversion, angle addition and subtraction.

Many statistical functions useful in both science and business are provided by the HP-27-including three new functions: variance, correlation coefficient and normal distribution. Summations of data points are stored for easy access. What's more, you can adjust or correct input data without having to repeat an entire calculation. Once your data is keyed in, you can calculate the means, standard deviations and variances for two variables. You can also calculate linear regression, linear estimates and the correlation coefficient for two variables. In addition, you can calculate the density function and upper-tail area under a normal distribution curve.

For convenience in solving both personal and job related business problems-such as mortgages, compound interests and sinking funds-all fundamental financial functions are preprogrammed into the HP-27 to eliminate the need for bulky books of equations and interest tables. Two new preprogrammed functions--net present value and internal rate of return for uneven cash f lows--facilitate capital budgeting and resource allocation. I n addition, the HP-27 provides three separate percentage functions for ease in calculating margins, markups, discounts, percents of totals, etc.

Compared to algebraic logic, the RPN logic system is faster, more efficient and more versatile in solving the complex problems faced by today's professionals in science and finance. For most calculations, it requires fewer keystrokes. You don't need parenthesis keys and you don't need to keep track of complicated hierarchies. Intermediate answers are displayed and stored automatically in an operational stack of four memories--so you never need to write them down and risk errors. And because only intermediate results are stored, the size and complexity of problems that can be handled with RPN logic are virtually unlimited.

The HP-27 Scientific/Plus gives you all the advantages of expanded memory capacity, selective memory clearing and three display modes. 20 memories help simplify your most difficult calculations. In addition to the 5 financial memories, the 4 operational stack memories and a last-x memory, the HP-27 provides 10 addressable memories for data storage. This large memory capacity lets you make highly complex and lengthy calculations with ease and assurance. Displayed values may be stored in any addressable memory and later recalled to the display. In addition, register arithmetic can be performed on all ten addressable memories.

With the CL*x* key, you can clear the display only. You can clear all
four memories of the operational stack with the STK key. The last six addressable
memories, which are used for statistics, are cleared with the Sum key. The
REG key clears all ten addressable memories, all five financial memories
and the last-x memory Or you can clear the status of the financial memories
with the RESET key. In addition, you can clear the prefix keys with the key
labeled PREFIX.

In fixed decimal, the most commonly used notation, you can display between
0-9 places to the right of the decimal point. Whenever the value is too large
or too small to be displayed in fixed notation, the display automatically
changes to scientific notation. In scientific notation, useful when working
with very large or small numbers, values are displayed with a single digit
to the left of the decimal point followed by up to seven digits to the right,
and a two-digit exponent. In engineering notation, useful in working with
many units of measure, such as kilo (10^{3}), nano (10^{-9}),
etc., values are displayed with exponents that are multiples of 3.

- Battery pack that under normal use provides 3 hours of operation and fully charges in under 6 hours.
- Recharger/AC adapter that lets you operate the calculator on AC while the battery pack is recharging.
- Soft carrying case with belt loop.
- Illustrated Owner's Handbook with instructions and sample problems.

Optional Accessories (Details sent with HP-27)

- Security cradle lets you secure your HP-27 to your work area.
- Reserve power pack provides a spare battery pack and keeps it fully charged.

The HP-27 is warranted against defects in materials and workmanship for one year from the date of delivery. During the warranty period, Hewlett-Packard will repair, or at its option, replace at no charge components which prove to be defective, provided the calculator is returned shipping prepaid, to Hewlett-Packard's Customer Service facility.

This warranty does not apply if the calculator has been damaged by accident or misuse, or as a result of service or modification by other than an authorized Hewlett-Packard Customer Service facility. No other express warranty is given by Hewlett-Packard. HEWLETT-PACKARD SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES.

HP pocket calculators are designed and built for you-the business or professional person-who needs a calculator rugged enough for day-in, day-out use and as up-to-date as tomorrow.

HP pocket calculators meet these requirements-and more-because they're the most advanced pocket calculators in the world.

Every key is double injection molded. The symbol on the face of the key goes through the entire key, so it won't wear off--no matter how often the key is pressed.

Every key is tested twice. A quality control inspector presses the keys to make sure they feel right, then a specially designed machine exercises them to make sure they function right.

Under the keyboard is a moisture-proof polyethylene barrier to help protect the inside of the calculator from coffee spills and similar hazards.

The heavy gauge plastic case is contour-designed to fit the hand comfortably, and rugged enough to withstand a tumble to a hard floor. (One HP pocket calculator even withstood an accidental journey through a snow blower.)

Uncompromising quality, innovative design, high quality components and precision assembly combine to produce calculators that are second to none.

Hewlett-Packard reserves the right to make changes in materials, specifications or accessories without notice.

__Mathematical Functions:__

sin, cos, tan |
--Trigonometric functions |

sin^{-1}, cos^{-1}, tan-1 |
--and their inverses |

DEG, RAD, GRD |
--Degrees, radians, and grads mode |

ln, e^{x} |
--Natural log and antilog |

log, 10^{x} |
--Common log and antilog |

y^{x}, x^{2} |
--Exponential functions |

->R, ->P |
--Rectangular/polar coordinate conversion |

H.MS+, H.MS- |
--Time (angle) addition and subtraction in hours, minutes and seconds |

->H.MS, ->H |
--Time (angle) conversion in hours, minutes and seconds to decimal hours (degrees). |

1/x. sqrt(x), pi |
--Convenient math functions |

+, -, x, ÷ |
--Arithmetic functions |

__Statistical Functions:__

Sum+ |
--Accumulates x, y, x^{2}, y^{2}, xy, n |

Sum- |
--Deletes unwanted data |

L.R. |
--Linear regression coefficients |

y^ |
- Linear estimate |

r |
--Correlation coefficient mean |

x bar |
--Mean--two variables |

s |
--Standard deviation--two variables |

VAR |
--Variance |

N.D. |
--Normal distribution |

n! |
--Factorial |

__Financial Functions:__

n |
--Number of periods |

I |
--Periodic interest rate |

PMT |
--Periodic payment amount |

PV |
--Present value of money |

FV |
--Future value of money |

NPV |
--Net present value |

IRR |
--internal rate of return |

% |
--Percent |

delta% |
--Percent difference |

%sum |
--Percent of total |

__Data Manipulation; display control, clearing options; storage functions:__

ENTER |
--Separates numerical entries |

x!=y |
--Exchanges contents of x and y stack registers |

R dn |
--Rolls down contents of stack registers |

CHS |
--Changes the sign of a number |

EEX |
--Enter exponent |

LASTx |
--Recalls last entry after an operation |

FIX |
--Sets fixed decimal notation display |

SCI |
--Sets scientific notation display |

ENG |
--Sets engineering notation display |

CLx |
--Clears display |

CLEAR STK |
--Clears stack |

CLEAR REG |
--Clears addressable registers, financial registers and LASTx |

CLEAR Sum |
--Clears summation registers |

CLEAR PREFIX |
--Clears prefix key |

RESET |
--Clears financial status for a new problem. |

STO |
--Stores displayed value into addressable register. |

RCL |
--Recalls a number to the display from an addressable register. |

f |
--Gold shift key; selects functions printed in gold on keyboard. |

g |
--Black shift key; selects functions printed in black on front face of keys. |

__Physical Specifications:__

- Calculator length: 130.2 mm (5-1/8")
- Calculator width: 68.3 mm (2-11/16")
- Calculator height: 30.2 mm (1-3/16")
- Calculator weight: 170.1 g (6 oz.)
- Recharger weight: 141.8 g (5 oz.)
- Shipping weight: 680 g (1-1/2 lb.)
- Operating temperature range: 0°C to 45°C (32°F to 113°F)
- Charging temperature range: 15°C to 40°C (59°F to 104°F)
- Storage temperature range: -40°C to 55°C (-40°F to 131°F)
- Power requirements: AC: 115 or 230V, +/- 10%, 50 to 60Hz
- Battery: 2.75 Vdc nickel-cadmium rechargeable battery pack

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