# The Nuclear Bomb Computer Slide Rule

Source: https://www.youtube.com/watch?v=C06yW0232Bc
Recap page: https://rapidrecap.app/video/C06yW0232Bc
Generated: 2025-10-15T17:32:13.307+00:00

---
## Quick Overview

The video explores the historical and technical significance of the 1957 "The Effects of Nuclear Weapons" pamphlet and the accompanying J.B. Carroll/Lovelace Foundation Nuclear Bomb Effects Computer, a circular slide rule used to calculate blast, thermal, and radiation effects, demonstrating how this cheap plastic tool provided critical data that informed Cold War planning and survival strategies.

**Key Points:**
- The pamphlet "The Effects of Nuclear Weapons," first published in 1957 by Samuel Glasstone and Philip J. Dolan, details the physical and biological consequences of nuclear explosions.
- The accompanying Nuclear Bomb Effects Computer, a circular slide rule developed by the Lovelace Foundation, cost only $1 and was designed to calculate 28 different effects, including blast overpressure and thermal radiation radii, based on weapon yield.
- The narrator uses the computer to calculate that a 15-kiloton surface burst (similar to the Hiroshima bomb) would result in a blast wave velocity of 30 feet per second at a range of 1.6 miles, and an initial nuclear radiation dose of 10 to 50 rems at a distance of 0.3 kilometers.
- The pamphlet was updated three times, with the last revision in 1976, and contains 730 pages of technical data, including 18 figures, graphs, and tables.
- The video contrasts the detailed calculations possible with the computer against the lack of preparation knowledge in the immediate aftermath of Hiroshima in 1945, highlighting the necessity of such tools for emergency responders and public officials.
- The narrator expresses admiration for the complex yet inexpensive nature of the analog computer, noting that its data aligns closely with modern simulations, which reinforces the historical accuracy of the pamphlet's predictions.

![Screenshot at 0:15: The Nuclear Bomb Effects Computer, a circular slide rule developed by the J.B. Carroll/Lovelace Foundation, shown mounted in a display case, illustrating its purpose as a physical tool for calculating nuclear blast effects.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-00-15.png)

**Context:** The video focuses on historical artifacts from the early Cold War era related to nuclear warfare preparedness: the 1957 government pamphlet, "The Effects of Nuclear Weapons," and a specialized analog calculation tool called the Nuclear Bomb Effects Computer. The narrator, speaking from a futuristic-looking laboratory set, frames these items as crucial pieces of scientific communication from a time when the world was rapidly learning the consequences of atomic weaponry.

## Detailed Analysis

The video showcases and explains the functionality of the 1957 pamphlet, "The Effects of Nuclear Weapons," co-authored by Samuel Glasstone and Philip J. Dolan, and its companion device, the Nuclear Bomb Effects Computer. This computer, a circular slide rule made of cheap plastic, was designed to allow users to quickly calculate 28 different effects resulting from a nuclear detonation, ranging from blast overpressure and thermal radiation to initial nuclear radiation dose and crater dimensions, based on weapon yield (up to 20 megatons). The narrator emphasizes the tool's incredible value, costing only $1 at the time, and its ability to provide essential technical data for emergency planners and government officials during the Cold War. Through a demonstration, the narrator sets the computer for a 15-kiloton surface burst (like the Hiroshima bomb) and derives specific effects, such as a blast wave velocity of 30 feet per second at 1.6 miles and an initial radiation dose of 10 to 50 rems at 0.3 kilometers. The video contrasts this level of detailed, accessible calculation with the lack of knowledge present immediately after the 1945 bombings. The narrator concludes by expressing admiration for the object as both a scientific artifact and a communication tool, contrasting its analog complexity with modern digital simulations.

### The Artifacts

- The pamphlet "The Effects of Nuclear Weapons" (1957, updated through 1976)
- The companion Nuclear Bomb Effects Computer, a circular slide rule
- The computer was designed to calculate 28 effects based on weapon yield.

### Computer Functionality

- The device is a mechanical calculator using concentric rotating scales
- It estimates blast effects (e.g., overpressure, wind speed), thermal radiation, and biological effects (radiation dose in rems).

### Demonstration Calculation

- A 15-kiloton surface burst example is used
- Yield is set to 15 kilotons on the large circle
- Blast wave velocity at 1.6 miles is calculated to be 30 ft/sec
- Initial radiation dose at 0.3 km is calculated to be 10-50 rems.

### Historical Context

- The pamphlet emerged in the post-Hiroshima era when preparation for nuclear war was critical
- The computer allowed for rapid estimations vital for emergency responders and public officials.

### The Creator's Intent

- The narrator admires the object's complexity and low cost ($1)
- He suggests the calculations align well with modern simulations, validating the historical data.

### Conclusion and Call to Action

- The narrator hopes this knowledge remains theoretical, preventing the need to use the calculations
- He thanks supporters and promotes joining the private Discord community.

![Screenshot at 0:04: The cover of the original 1957 pamphlet, "The Effects of Nuclear Weapons," by Glasstone and Dolan, setting the historical context.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-00-04.png)
![Screenshot at 0:15: A close-up shot of the physical J.B. Carroll/Lovelace Foundation Nuclear Bomb Effects Computer, highlighting its intricate design as a circular slide rule.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-00-15.png)
![Screenshot at 0:49: The title page of the updated 1977 edition of the pamphlet displayed on a monitor, confirming the document's official government origin and multiple revisions.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-00-49.png)
![Screenshot at 1:13: A split-screen YouTube thumbnail titled "Surviving the Bomb" contrasts the destruction of a nuclear blast with a peaceful, modern cityscape \(Hiroshima\), illustrating the video's central theme.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-01-13.png)
![Screenshot at 1:51: An archival title card reading "FALLOUT" under a shower of particles, introducing the topic of residual radiation effects.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-01-51.png)
![Screenshot at 2:54: A close-up shot of the physical, aged 1957 pamphlet being held open, showing the yellowed paper and dense technical text.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-02-54.png)
![Screenshot at 3:11: The Nuclear Bomb Effects Computer being revealed from a pocket sleeve inside the pamphlet, emphasizing its inclusion as a physical accessory.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-03-11.png)
![Screenshot at 3:58: A detailed close-up of the teal-colored front side of the slide rule, showing scales for blast effects like overpressure and thermal energy emission.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-03-58.png)
![Screenshot at 4:05: The reverse \(white\) side of the computer, showing scales related to biological effects like acute exposure to ionizing radiation \(measured in rems\).](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-04-05.png)
![Screenshot at 8:44: A modern nuclear blast simulation map of Hiroshima overlaid with concentric rings showing damage radii, used to compare against the analog computer's results.](https://ss.rapidrecap.app/screens/C06yW0232Bc/00-08-44.png)