materials and equipment
CALCULATOR
The TEC AM-602 adding and mul- tiplying machine features a 'short cut' multiplication facility that eliminates repetitive addition operations.
Measuring 9 in. wide by 13-3/8 in. deep by 6 in. high, the calculator is housed in an unbreakable grey-and- white plastic case and operates on mains power. Standard features in- clude a printed record of all calcula- tions with 11-place entry printing, fast power operation with light touch and a simple key layout, two-colour print- ing with a negative-total warning in- dicator and single-key repetitive add- ing and subtracting.
A second set of keys is provided for recording the multiplication factor so that instead of having to resort to
TEC AM-602 calculator
repetitive addition, the user can adopt the short-cut method that calculating machines provide.
The makers are Tokyo Electric Co. Ltd., 5th Hasegawa Building, 14-8, 1-chome, Uchi-Kanda, Chiyoda-ku, Tokyo.
PROTRACTOR
An isometric protractor that mea- sures angles in the three isometric planes and indicates projection angles for ellipses has been added to the Linex range.
The instrument, No. 790, is made of light green parallax-free plastic. It has deep-etched lines and lettering and is hand finished.
It consists basically of a 190-mm. circular protractor seen in isometric projection. The elliptical protractor is on the lower half encircled by half a
hexagon, which facilitates its placing in correct direction of axis by supporting one side of the hexagon on a draught- ing machine or T-square.
To make the marking of angles easier, the graduated arc on the lower
LIVET
Linex 790 protractor
half has been placed around a half- elliptic cut-out. The upper half-elliptic part is provided with zero point and guide lines in the isometric-axis direc- tions, and between the axes it is divided from 0 to 90 degrees and back to 0 degrees.
The half hexagon makes it easier to place the protractor on the three iso- metric main planes, and isometric cubes are imprinted on the edges, the side on which one is working being dark, thus showing the correct placing. The protractor also has indications of circle projections for different direc tions of angles in the shape of ellipses from 5 to 55 degrees.
The makers are Linex A/S, 24 Gun- nekaer, Dk-2610 Rodovre, Copen- hagen, Denmark. Agents include: Scientific Service Co. Ltd., Hong Kong; Motion, Smith and Son Ltd., Kuala Lumpur and Singapore; and D.H.A. Siamwalla Ltd., Bangkok.
SURVEYING KIT
A great saving of time over conven- tional surveying methods is claimed for the Elliott Profile Recorder NX-12. A simple two-wheeled mechanical device, the recorder automatically plots on to a paper chart the profile of terrain over which it is wheeled.
The NX-12 comprises a damped pendulum mounted in a glass-fibre housing which is carried on a two- wheeled tubular-steel frame. The rota- tion of the rear wheel measures the
slope distance covered, and the pen- dulum senses the variation of the slope from the horizontal as the assembly is pushed along by a handle linked to the centre of the frame.
Information from the rear wheel and the inclination detected by the pendulum are both fed into a mech- anical analogue unit, also contained in the glass-fibre housing which resolves the horizontal and vertical com- ponents of the instrument's motion.
These two components are record- ed directly on to a chart which is graduated to measure to 10 m. of up- hill or downhill gradient and up to 5 km. horizontally, with a vertical scale of 1:100 and a horizontal scale of 1:500. If vertical control is provided every 1,000 m., it is said that tests will show 99 per cent of the recorded heights to be accurate within 0.5 m., 85 per cent within 0.3 m., and 80 per
cent within 0.2 m.
A lightweight device of approx- imately 30 kg., the profile recorder
Profile recorder NX-12
has overall dimensions of 533 mm. dong by 330 mm. wide by 1.371 m.
long.
The makers are Terratest (GB) Ltd., 66 High Street, Walton-on- Thames, Surrey, UK.
DRAWING FURNITURE
The 15-91 range of matching draw- ing-office furniture has been designed to accept drawing paper in both anti- quarian and metric sizes. Its main fea- tures include structural frames made of 32-mm.-square steel tubing, with table tops, drawers and storage units carried out in solid sapele.
Six main units make up the 15-91 range: a plan table, available in five different versions; a plan cabinet, with a choice of three or six drawers; double- and single-sided angled re- ference units; and long and short spur units. Measuring 1.524 m. long by 914
Far East BUILDER, July 1970
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