British made training film released to the US troops as the functions are the same. Pay no attention to the differences in terminology. This film begins with addition and subtraction we see how the gears mesh to accomplish this. Moving on to Multiplication and Division with a ball and disk. see the practical application of math preformed this way. See the solution of triangles with the addition of a spiral disk to the machinery. See the three dimensional cam that controls the angular range.
Sound, B&W

Film Quality ranges throughout this film from poor to good. I have watched this film several times and feel that the film quality does not detract from the ideas and history presented in this film. If you do not find this to be the case I will give you a full refund.

Another British made training film released to the US. Narrated by an American the differences in terms are dealt with. See an in depth explanation of the math involved for the director to calculate the horizontal, vertical, and time of flight ranges for the guns.
Sound, B&W

Film Quality ranges throughout this film from poor to good. I have watched this film several times and feel that the film quality does not detract from the ideas and history presented in this film. If you do not find this to be the case I will give you a full refund.

Another British made training film released to the US. This one lists the different terms for ease of understanding, but retains the original British narration. See an in depth explanation of the math involved for the director to calculate the horizontal, vertical, and time of flight ranges for the guns.
Sound, B&W

Film Quality ranges throughout this film from poor to good. I have watched this film several times and feel that the film quality does not detract from the ideas and history presented in this film. If you do not find this to be the case I will give you a full refund.