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MariettaO [177]
3 years ago
14

What inventor patented the first American movie projector?

Computers and Technology
2 answers:
vladimir1956 [14]3 years ago
5 0

Answer:

Thomas Edison

Explanation:

Edison's laboratory was responsible for the invention of the Kinetograph (a motion picture camera) and the Kinetoscope (a peep-hole motion picture viewer). Most of this work was performed by Edison's assistant, William Kennedy Laurie Dickson, beginning in 1888. Motion pictures became a successful entertainment industry in less than a decade, with single-viewer Kinetoscopes giving way to films projected for mass audiences. The Edison Manufacturing Co. (later known as Thomas A. Edison, Inc.) not only built the apparatus for filming and projecting motion pictures, but also produced films for public consumption. Most early examples were actualities showing famous people, news events, disasters, people at work, new modes of travel and technology, scenic views, expositions, and other leisure activities. As actualities declined in popularity, the company's production emphasis shifted to comedies and dramas.

This collection features 341 Edison films, including 127 titles also available in other American Memory motion picture groupings. The earliest example is a camera test made in 1891, followed by other tests and a wide variety of actualities and dramas through the year 1918, when Edison's company ceased film production. The presentation also offers a brief history of Edison's work with motion pictures as well as an overview of the different film genres produced by the Edison company.

yulyashka [42]3 years ago
3 0
Thomas edison is the answer
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emmainna [20.7K]

Answer:

In Python:

entry = input("Sentence: ")

while True:

   if entry.count(",") == 0:

       print("Error: No comma in string")

       entry = input("Sentence: ")

   elif entry.count(",") > 1:

       print("Error: Too many comma in input")

       entry = input("Sentence: ")

   else:

       ind = entry.index(',')+1

       if entry[ind].isnumeric() == False:

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       else:

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print("Valid Input")

Explanation:

This prompts the user for a sentence

entry = input("Sentence: ")

The following loop is repeated until the user enters a valid entry

while True:

This is executed if the number of commas is 0

<em>    if entry.count(",") == 0:</em>

<em>        print("Error: No comma in string")</em>

<em>        entry = input("Sentence: ")</em>

This is executed if the number of commas is more than 1

<em>    elif entry.count(",") > 1:</em>

<em>        print("Error: Too many comma in input")</em>

<em>        entry = input("Sentence: ")</em>

This is executed if the number of commas is 1

   else:

This calculates the next index after the comma

       ind = entry.index(',')+1

This checks if the character after the comma is a number

       if entry[ind].isnumeric() == False:

If it is not a number, the print statement is executed

<em>            print("Comma not followed by an integer")</em>

<em>            entry = input("Sentence: ")</em>

If otherwise, the loop is exited

<em>        else:</em>

<em>            break</em>

This prints valid input, when the user enters a valid string

print("Valid Input")

Note that: entry = input("Sentence: ") <em>is used to get input</em>

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Answer:

Following are the program to this question:

#include <iostream>//defining header file

using namespace std;

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{

float average=sum/n;//defining float variable average that holds average value  

return average;//return average

}

int main()//defining main method

{

float ar[ ] = {24.1,24.5,24.4,23.8,28.2,29.1,27.4};//defining float array

float sum;//defining float variable sum

int n=7,i;//defining integer variable  

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{

sum=sum+ar[i];//add value in sum variable

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return 0;

}

Output:

The average is: 25.9286

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In the main method a float array "ar" is declared that holds values, in the next line, float variable "sum" and integer variable "n, j" is used.

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