The radio transmission line calculator is two sided and consists of two concentric circles and a transparent plastic arm. On the obverse side, the largest outer circle consists of a decimal scale, running around the entire circumference, which is used for measuring the distance of "wavelengths towards generator" and "wavelengths toward load". The smaller inner circle contains a series of logarithmically spread polar graphs and grids, each with decimal measurements and scales for determining 'angle of reflection coefficient in degrees". The transparent plastic arm can be rotated 360 degrees around the slide and has two measurement scales, "min & max voltage limits" and "attenuation dissipation reflection", each in red. The reverse side of the calculator contains a set of instructions for usage as well as a set of examples with useful equations.
The pouch for the radio transmission line calculator is made from a black leather and features two inner sleeves, one for the circular slide and the other for the additional paperwork. The pouch opens at the top and can be fastened using two button clips on the right and left hand side of the flap. Printed on the front of the pouch is silver, "RADIO TRANSMISSION LINE / CALCULATOR / D.C.A. INDENT NO. G6E/2 / MADE BY / MELB > W&G < AUST. / FOR / COMMONWEALTH OF AUSTRALIA / DEPARTMENT OF CIVIL AVIATION". The inside of the flap also features "J.G. REED, 6-12-57", handwritten in blue pen.
The instruction booklet is made up of a cardboard cover and 12 paper pages. The booklet contains instructions for using the radio transmission line calculator and includes diagrams, figures, equations, examples of use and features occasional handwritten notes with shortcuts and user hints. The booklet also contains a stamp from the "Dept. of Civil Aviation, N.S.W. Region, Technical Library" on the cover and also on page 1.
The additional slide for the radio transmission line calculator is a transparent plastic circular slide with a small rectangular pointer on one side and two prongs on the opposite side for slotting around the calculators central pin. A single rules line stretches through the centre of the circle from the tip of the pointer.
The invoice for the purchase of the calculator from W & G Distributing Co. Pty. Ltd is addressed to "Mr J. G. Reed, Overseas Telecommunications Commission (Aust), BOX 7000. G.P.O, Sydney" and is dated "6th December 1957". The invoice is made out for "one only Radio Transmission Line Calculator, Plus 12 1/2 percent tax and packing and postage", totalling 3 pounds 13 shillings and 6 pence.
The receipt from White & Gillespie (Melb.) Pty. Ltd for the calculator was originally stapled to the back of the invoice. The receipt features the date, "2/12/57", the receipt number, "8313" and the name, "J.G. Reed", handwritten in blue pen. No price is listed.
The envelope that contains the invoice and receipt features, typed on the front, "receipts for purchase:- / RADIO TRANSMISSION LINE CALCULATOR", while the back features the logo for the "Overseas Telecommunications Commission, O.T.C."