Monthly Archives: March 2013

Distibution of Catholics Around the World

Introduction I am showing one of my sons how to use Excel pivot tables, so I am looking for good data analysis examples that illustrate the power of pivot tables. The election of a pope has put Catholicism in the … Continue reading

Posted in General Mathematics | Leave a comment

A World War 1 Mechanical Torpedo Fire Control Computer

I have discussed the basic calculations behind firing "straight-running" torpedoes in other posts (here, here, and here). Youtube has a couple of interesting videos showing a basic mechanical torpedo fire control computer from World War 1. It is a nice … Continue reading

Posted in History of Science and Technology, Underwater | 1 Comment

Hometown Humor

My brother called the other night and said that he was going to attend a live show with Kevin Kling, a well-known comedian we grew up with in Osseo, Minnesota. In my youth, Osseo was a small agricultural community on … Continue reading

Posted in Osseo, Personal | Leave a comment

Spline Interpolation Example Using Battery Capacity

Introduction I had a conversation with a customer recently who wanted to estimate the capacity and running time of their electronic systems when operating from batteries that are under various current load and temperature stresses. The battery manufacture had only … Continue reading

Posted in Batteries, General Mathematics | Leave a comment

Battery Life Dissipated Under Varying Temperature Conditions

Introduction I am not getting any younger. As I age, I have come to realize that certain activities age me faster than others. For example, I have no doubt that sitting in meetings for hours every day has deleterious effects … Continue reading

Posted in Batteries, Electronics | 1 Comment

Asteroid Belt Mass Distribution Analysis

Introduction The meteor explosion over Russia really interests me and I have been reading as much about it as I can. While reading about meteors and asteroids, I encountered the following statement. The total mass of the asteroid belt is … Continue reading

Posted in Astronomy | Leave a comment