ROTOSCOPE

Rotoscoping is an animation technique in which animators trace over footage, frame by frame, for use in live-action and animated films. Originally, recorded live-action film images were projected onto a frosted glass panel and re-drawn by an animator.

The technique was invented by Max Fleischer, who used it in his series 'Out of the Inkwell' starting around 1915, with his brother Dave Fleischer dressed in a clown outfit as the live-film reference for the character 'Koko the Clown'. Max patented the method in 1917.

The FLEISCHER Brothers.

Fleischer Studios, Inc. is an American corporation which originated as a New York animation studio. It was founded in 1921 by brothers Max Fleischer and Dave Fleischer, who ran the company from its inception until they were fired by parent company and distributor Paramount Pictures in April 1942. 
Max Fleischer was responsible for the provocative, adult-oriented, cartoon Betty Boop vamp-character, who always wore a strapless, thigh-high gown (and visible garter) and was based on flapper icon Clara Bow's 'It' Girl and Mae West. A prototype of the squeaky- and baby-voiced cartoon queen (voiced for most of the 30s by Mae Questel) was introduced in a Bimbo Talkartoon entitled Dizzy Dishes (1930) - with her appearing as a long-eared puppy dog! In the early cartoon Betty Co-Ed (1931), she was called Betty, and in a pre-Code Bimbo cartoon entitled Silly Scandals (1931) (the title spoofed Disney's Silly Symphonies), she was named Betty Boop for the first time (she sings You're Driving Me Crazy while her dress top keeps falling down). However, in Stopping the Show (1932), she appeared under her own credits banner for the first time (she had previously appeared only in Talkartoons and Screen Songs). 

Betty Boop Clip - [1932] 

Lotte REINIGER

Charlotte "Lotte" Reiniger (June 2, 1899 – June 19, 1981) was a German silhouette animator and film director. 

Lotte Reiniger created and directed many successful animations. here are some example -->

Clip Of Lotte Reinigers 'Cinderella   '1919 The Ornament of the Lovestruck Heart 1920 Amor and the Steady Loving Couple 1921 The Star of Bethlehem 1922 Sleeping Beauty 1922 The Flying Suitcase 1922 The Secret of the Marquise 1922 Cinderella 1923–26 The Adventures of Prince Achmed (feature) 1923 Dr. Dolittle and His Animals (3 shorts) 1927 The Chinese Nightingale 1928 The Seemibngly Dead Chinese 1930 Ten Minutes of Mozart 1931 Harlekin 1932 Sissi 1955 Hansel and Gretel 1955 Jack and the Beanstalk 1961 The Frog Prince 1975 Aucassin and Nicolette 1979 The Rose and the Ring