By N. David Mermin
Boojums all through is a set of essays that offers the predicament of speaking sleek physics to either physicists and nonphysicists. a few addressed to a common viewers, a few to scholars and others to scientists, the essays all proportion a preoccupation with either the substance and the fashion of written clinical verbal exchange, and supply a distinct view of daily technological know-how or clinical perform with the purpose of elevated readability for the reader. the writer believes the culture of bland and impersonal clinical writing during the last fifty years deprives scientists of robust instruments for reinforcing their readability and capability to speak complicated principles. A good well-known theoretical physicist and winner of the 1st Julius Edgar Lilienfeld prize of the yankee actual Society, Mermin writes with wry humor and conveys advanced rules with startling simplicity.
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Present arms" military attitude without regulation equipment, front view.. Projection of the centres of the joints; 8 projection of the centres of gravity of the head, hands and rifle;  S projection of the centre of gravity of the whole body with rifle 53 Fig. 12. Shooting attitude without regulation equipment, side view.. Projection of the centres of the joints; G projection of the centres of gravity of the head, hands and rifle; D S projection of the centre of gravity of the whole body with rifle 54 Fig.
These projections are reliably obtained by photographing a side and a front view. The plane XY of the rectangular system of co-ordinates is the horizontal ground. Axis Z is the vertical line through the middle of the line connecting the centres of the two hip joints. Axis X is directed postero-anteriorly, and axis Y transversely. The rectangular system of co-ordinates is thus complete if we add that axis X is positive forwards, axis Y is positive to the right and axis Z is positive upwards. To orientate the body precisely.
We call xo, Yo, Zo the co-ordinates of the centre of gravity N. From the position of point N on the connecting line AB it follows that: XO-XI P2 X2- XO PI 32 Yo- YI Y2 - Yo PI Zo- ZI P2 Z2 - PI Zo P2 Therefore, the co-ordinates of the centre of gravity are: PI XI + P2 X2 XO= PI +P2 PIYI + P2Y2 YO= PI+P2 PI ZI + P2 Z2 Zo = PI +P2 If there are three parallel forces PI, P2, P3, the points of application of which have as co-ordinates XI> YI, ZI; X2, Y2, Z2; and X3, Y3, Z3, these three parallel forces can be combined into one resultant.